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: Dental
Number of fossa in upper 1st molar 
Select and explain. 
A. 2 major 2 minor, B. 3 major 2 minor, C. 2 major 1 minor, D. 1 major 2 minor
A: 2 major 2 minor
Answer: A: 2 major 2 minor 
Explanation: 2 major fossa = Distal and Central
2 minor fossa also known as triangular fossa= Distal and Mesial