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 for non-hodkin's lymphoma is - \nSelect and explain. \nA. Stomach, B. Brain, C. Intestines, D. Tonsils", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]