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': 'Caries associated with pre-eruptive enamel hypoplasia: \nSelect and explain. \nA. Secondary caries., B. Chronic caries., C. Occult caries., D. Incipient caries.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]