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: Medicine
[{'content': 'Which of the following conditions may cause Anhydrosis of the homolateral side of the face: \nSelect and explain. \nA. Cervical sympathetic paralysis, B. Facial nerve trauma, C. Trigeminal nerve trauma, D. Cerebral embolus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]