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: Ptosis does not occur in Marfans syndrome. Ref: Management of Genetic Syndrome By Suzanne B, 3rd Edition, Page 509 ; Clinical Ophthalmology By Kanski, 3rd Edition, Page 493 and 4th Edition, Page 180-1, 376-77 3. Comprehensive Ophthalmology By A K Khurana, 4th Edition, Page 202', 'role': 'assistant'}]