This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Surgery
[{'content': 'Diaphragm paralysis happens in which nerve damage \nSelect and explain. \nA. Phrenic, B. Intercostal, C. Vagus, D. Hypoglossal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Phrenic nerveRef: Internet sourcesCauses of Diaphragm paralysis:* Neurological causes:# Phrenic nerve palsy# Motor neuron disease# Neuropathies# Myopathies* Viral infections* Tumors* Trauma* Surgical Operations', 'role': 'assistant'}]