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': "A 19-year-old boy fell from the motet- bike on his shoulder. The doctor diagnosed him a case of Erb's paralysis. The following signs and symptoms will be observed except- \nSelect and explain. \nA. Loss of abduction at shoulder joint, B. Loss of lateral rotation, C. Loss of pronation at radioulnar joint, D. Loss of flexion at elbow joint.", 'role': 'user'}, {'content': "Answer: C \nExplanation: Movements lost in Erb's paralysis : -\n\n\nAbduction and lateral rotation of shoulder.\nFlexion and supination of the forearm.\nBiceps and supinator jerks are lost\nSensations are lost over a small area over the lower part of deltoid.", 'role': 'assistant'}]