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
Largest cusp in permanent mandibular first molar is: 
Select and explain. 
A. Mesiobuccal, B. Distobuccal, C. Mesio lingual, D. Distal
A: Mesiobuccal
Answer: A: Mesiobuccal 
Explanation: None