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: Pathology
[{'content': 'Developmental enamel defects are most commonly seen in \nSelect and explain. \nA. Primary incisors, B. Primary 2nd molar, C. Permanent incisors, D. Permanent 1st molar', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]