This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Evaluation of a Thyroid Nodule, Subject name: Surgery
[{'content': 'A case of solitary thyroid nodule, Investigation of choice is: \nSelect and explain. \nA. T3, T4 estimation, B. Thyroid scan, C. FNAC, D. Excision biopsy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans is \'c\' ie FNAC "FNAC is the investigation of choice in discrete thyroid swellings"-Bailey & Love', 'role': 'assistant'}]