What are sinuses?

English Language Tests, Intermediate level

ESL/EFL Test #769 [color=blue]“Dialogue Practice: Going to the Doctor (1)”, question 3

Doctor: Are your sinuses as well?

(a) swamped
(b) stuck
(c) congested
(d) steamed

English Language Tests, Intermediate level

ESL/EFL Test #769 [color=blue]“Dialogue Practice: Going to the Doctor (1)”, answer 3

Doctor: Are your sinuses congested as well?

Correct answer: (c) congested
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what is sinuses?

Don’t you have a DICTIONARY?