This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy 3, Subject name: Anatomy
[{'content': 'Apical lung tumor causes \nSelect and explain. \nA. C/L horner syndrome, B. Post ganglionic fibres involved, C. 1deg neuron injury, D. Loss of sweating on same side of face', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Apical lung cancer/ Pancoast tumor causes - 2deg neuron injury (Preganglionic sympathetic fibres) I/L horner syndrome (Cervical sympathetic chain and ganglion involved) Loss of sweating on same side of face 1deg sympathetic neuron injury occurs in Wallenberg syndrome 2deg sympathetic neuron (preganglionic fibers) injury occurs in Apical lung cancer 3deg sympathetic neuron (postganglionic fibers) injury occurs in Internal carotid aery disection', 'role': 'assistant'}]