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
[{'content': 'Which of the following cusps of the mandibular first molar has the maximum thickness of enamel and dentin \nSelect and explain. \nA. Mesiolingual, B. Mesiobuccal, C. Distal, D. All have same thickness', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]