Which Statement Is True About the Paranasal Sinuses

Multiple Choice

Which statement is true about the paranasal sinuses?

A) They are fluid-filled, bony structures of the face.
B) The sinuses contain resident bacteria.
C) The classic sign of a sinus infection is a headache.
D) Sinus infections are treated with decongestants, antibiotics for bacterial infections, and analgesics.
E) Both C and D are true.