This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Meningitis and Encephalitis, Subject name: Medicine
[{'content': 'Most common cause of Carcinomatous meningitis- \nSelect and explain. \nA. Carcinoma breast, B. Carcinoma lung, C. Carcinoma gut, D. Malignant melanoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans is 'a' i.e. Carcinoma breasto Carcinoma breast in the most common cause of carcinomatous men incites", 'role': 'assistant'}]