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': 'The mechanism of injury of transverse fracture of medial malleolus results due to -a) Abduction injuryb) Adduction injuryc) Rotation injuryd) Direct injury \nSelect and explain. \nA. a, B. bc, C. ad, D. ac', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Transverse fracture of medial malleolus occurs in Pronation-abduction and pronation-external rotation injury.', 'role': 'assistant'}]