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': 'A 45-yrs-old man presents with progressive cervical lymph nodes enlargement, since 3 months; the most diagnostic investigation is - \nSelect and explain. \nA. Xray soft tissue, B. FNAC, C. Lymph node biopsy, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Harrison writes that in cases of lymphadenopathy, if the patient\'s history and physical findings are suggestive of malignancy, then a prompt lymph node biopsy (excisional biopsy) should be done.\nFNAC is not of much use, as it does not provide enough tissue to reach a diagnosis. ("FNAC should be reserved for thyroid nodules and for confirmation of relapse in patients whose primary diagnosis is known." - Harrison)', 'role': 'assistant'}]