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
Normally Maxillary first molar has 
Select and explain. 
A. 3 roots and 3 canals, B. 3 roots and 4 canals, C. 2 roots and 3 canals, D. 2 roots and 4 canals
A: 3 roots and 3 canals
Answer: A: 3 roots and 3 canals 
Explanation: None