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': 'The primary teeth that present the most outstanding morphologic deviations from permanent teeth are: \nSelect and explain. \nA. Central incisors, B. Mandibular first molar, C. Mandibular second molar, D. Canines', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]