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
Stensons duct of parotid opens opposite to 
Select and explain. 
A. Upper second premolar, B. Lower second premolar, C. Lower second molar, D. Upper second molar
D: Upper second molar
Answer: D: Upper second molar 
Explanation: None