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: Ophthalmology
[{'content': "In Weber's syndrome there is: \nSelect and explain. \nA. 3rd nerve palsy, B. 4th nerve palsy, C. 5th nerve, D. 7th nerve", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. 3rd nerve palsy', 'role': 'assistant'}]