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: Surgery
[{'content': "The most common site of enlargement of the lymph nodes in Hodgkin's lymphoma is - \nSelect and explain. \nA. Mediastinal, B. Axillary, C. Cervical, D. Abdominal", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Schwartz writes - "In about 50% of patients who have both Hodgkin\'s and non-Hodgkin\'s lymphoma, the mediastinum may be the primary site."', 'role': 'assistant'}]