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': 'A minor connector contacting the axial surface of an abutment should not be located on a \nSelect and explain. \nA. Flat surface, B. Concavo-convex surface, C. Convex surface, D. Concave surface', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]