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; most diagnostic investigation is: \nSelect and explain. \nA. X-ray soft tissue, B. FNAC, C. Lymph node biopsy, D. None of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: In cervical lymph node enlargement, if no mucosal lesion is detected, an excision biopsy of the largest node should be performed. Ref: Harrison's Internal Medicine, 15th Edition, Page 362 and 18th Edition, Page 467.", 'role': 'assistant'}]