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': 'Ptosis with orbicularis oculi palsy is seen in: \nSelect and explain. \nA. Eaton Lambe syndrome, B. Myasthenia gravis, C. Polymyositis, D. Motor neuron disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Myasthenia gravis', 'role': 'assistant'}]