What distinguishes our product from any other product available in the market.
Please suggest in the above-mentioned sentence, should it be “distinguishes” or “distinguish” if there are several reasons that make my product distinguished.
I would refer to it as:
Reasonable price is what distinguishes our product from any other products available in the market.
Small size and smart design [= the combo of advantages] is what distinguishes our product from any other products available in the market.
But: Small size and smart design distinguish our product from any other products available in the market.
Even if there are several reasons, the question will usually be: What distinguishes … ? (I think Eugene has not got what you meant)
Not so straightforward in my view. Even if you treat the original as a question (which was not obvious), then you could meet : Interview question for Supply Chain Analyst in Vancouver, BC. What distinguish you from other candidates? Why should I hire you?
What Distinguish One from Its Peers in Social Networks?.
What distinguish teams from social aggregates?
What distinguish candidates of top schools from so so schools?
What distinguish the kingdom fungi from other kingdoms?
What distinguish us? Possibility of international cooperation in the EU countries.
Maybe, what you say is correct for you. But to me, what I said still stands good.
Your questions suggest that there are many (preconceived) aspects/factors while a normal questioner is not expected to assume them to be so.
For instance, to my question ‘What makes you think that it is not correct?’, you may say that there are many reasons. But, I cannot assume your answer to be so (that you will have many reasons) and ask you ‘What make you think that it is not correct?’ which, in my view, is not natural.
Hi Eugene,
What distinguishes… is the only possible option in your sentences.
To use ‘distinguish’ you would need to add a plural noun before it:
What traits/skills distinguish you from other candidates?
Since nobody else has come out with a differing opinion, I’d like to thank Bev for being in agreement with my contention.
Eugene, I hope I haven’t used any irritating, insulting or belittling diction while re-asserting my view. That was a meaningful discussion. Thank you for your patience.
Hi Bev,
As you see, I only cited what I found in the Net, some of them appearing to be natives. Since the BNC provides no returns on the ‘what distinguish’ version, I will certainly accept ‘what distinguishes’ as the valid one, still you may have noticed some ‘irregularities’ as to its use.
Hi Anglophile,
Being mentally sound (so far so good), I think I can distinguish between meaningful discussion and barbed personal remarks. Keep calm and carry on. 
I can’t say I’ve ever come across anyone trying to use ‘what distinguish.’’ rather than ‘distinguishes’ as in your examples, Eugene.
I would assume that all those are written either by learners of the language or semi-literate native English speakers.
Thanks, Eugene. Keep it up!