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': "Bilateral ptosis is not seen in- \nSelect and explain. \nA. Marfan's syndrome, B. Myaesthenia gravis, C. Myotonic dystrophy, D. Kearns sayre syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]