This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
All drains into middle meatus except - 
Select and explain. 
A. Lacrimal duct, B. Maxillary sinus, C. Frontal sinus, D. Ethmoidal sinus
A: Lacrimal duct
Answer: A: Lacrimal duct 
Explanation: None