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': 'Lambert Eaton syndrome is associated with - \nSelect and explain. \nA. Thymoma, B. Oat cell syndrome, C. Myasthenia gravis, D. Adenocarcinoma of lung', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]