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': 'A person has restricted eye movements in all directions, ptosis but no squint or diplopia. What is diagnosis: \nSelect and explain. \nA. CPEO, B. Multiple cranial nerve palsy, C. Myasthenia gravis, D. Orbital apex syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. CPEO', 'role': 'assistant'}]