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: Orthopaedics
[{'content': 'What is acceptable angulation after reducing the fracture tibia - a) 5  b) 10  c) 15  d) 20 \nSelect and explain. \nA. ab, B. bc, C. ad, D. ac', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Criteria of acceptable reduction\n\nAcceptable varus or valgus angulation is 5°.\nAcceptable anterior or posterior angulation is 10°.\nAcceptable rotational malalignment is 5°.\nAcceptable shortening is 10 mm\nAnkle and knee joint surfaces should be parallel', 'role': 'assistant'}]