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: Pathology
[{'content': 'Most Common extranodal site of Lymphoma in 14W is? \nSelect and explain. \nA. CNS, B. GIT, C. Retroperitoneum, D. Mediastinum', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., CNS", 'role': 'assistant'}]