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': 'Number of line angles in class 4 cavity: \nSelect and explain. \nA. 8, B. 6, C. 11, D. 14', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]