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': 'Kalu, a 6-year-old child, received tetracycline. Noticeable discoloration will be seen in: \nSelect and explain. \nA. Premolars, incisors and 1st molars, B. Canine and 2nd molars, C. Canines, premolars and 2nd molars, D. Incisors and 1st molars', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]