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: Surgery
[{'content': 'What degree of angulation is acceptable after reducing fracture of tibia? \nSelect and explain. \nA. 5, B. 10, C. 15, D. 20', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A varus deformity of > 50 is not acceptable.', 'role': 'assistant'}]