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': 'Ovate pontic are used in: \nSelect and explain. \nA. Well rounded ridges, B. Knife edged ridges, C. Recently extracted tooth sockets, D. Flat ridges', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]