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': 'Serial extractions are indicated in patients who have: \nSelect and explain. \nA. Class II molar relation, B. Excessive overbite, C. Class I molar relation, D. Class III molar relation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]