This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
Most superior sinus in the face is? 
Select and explain. 
A. Frontal sinus, B. Ethmoid sinus, C. Maxillary sinus, D. Sphenoid sinus
A: Frontal sinus
Answer: A: Frontal sinus 
Explanation: Ans. (a) Frontal sinusRef: Gray's Basic Anatomy 40th ed p 562