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
Which of the following is initial investigation of choice for a patient presenting with solitary nodule of thyroid: 
Select and explain. 
A. Thyroid function test, B. FNAC, C. Radionuclide scan, D. MRl
B: FNAC
Answer: B: FNAC 
Explanation: The first investigation is USG neck followed by FNAC of the swelling.