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': 'Space maintainers are usually needed in the: \nSelect and explain. \nA. Mandibular primary incisor teeth area, B. Mandibular primary canine teeth area, C. Mandibular primary second molar area, D. Maxillary primary incisor teeth area', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]