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
Maxillary first molar has how many roots? 
Select and explain. 
A. 1 facial and 2 lingual, B. 1 lingual and 2 facial, C. 1 mesial and 2 buccal, D. 1 mesial and 1 distal
B: 1 lingual and 2 facial
Answer: B: 1 lingual and 2 facial 
Explanation: None