This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
[{'content': "The most common site of enlargement of the lymph nodes in Hodgkin's lymphoma is \nSelect and explain. \nA. Cervical, B. Axillary, C. Mediastinal, D. Abdominal", 'role': 'user'}, {'content': 'Answer: C \nExplanation: In about 50% of patients who have both Hodgkin\'s and non-Hodgkin\'s lymphoma, the mediastinum may be the primary site." Ref : Schwaz 9/e p575', 'role': 'assistant'}]