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
Only tooth in which buccal surface is made of 2 lobes 
Select and explain. 
A. Upper 1st molar, B. Lower 1st molar, C. Upper 2nd molar, D. Lower 2nd molar
A: Upper 1st molar
Answer: A: Upper 1st molar 
Explanation: None