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': 'Which of the following is initial investigation of choice for a patient presenting with solitary nodule of thyroid: \nSelect and explain. \nA. Thyroid function test, B. FNAC, C. Radionuclide scan, D. MRl', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The first investigation is USG neck followed by FNAC of the swelling.', 'role': 'assistant'}]