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': "Diagnosis of Hodgkin's disease is confirmed by ? \nSelect and explain. \nA. CT scan, B. Bone marrow biopsy, C. Lymph node biopsy, D. Lymphangiography", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Lymph node biopsy", 'role': 'assistant'}]