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 primary tooth does not resemble any permanent tooth? \nSelect and explain. \nA. Primary Mand. 1st Molar, B. Primary Mand. 2st Molar, C. Primary maxillary .2st Molar, D. Primary canine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]