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 nerve is most commonly affected in diabetic mononeuropathy: March 2013 \nSelect and explain. \nA. Optic, B. Oculomotor, C. Facial, D. Vagus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Oculomotor', 'role': 'assistant'}]