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 lady with a long-standing thyroid nodule is planned for a subtotal thyroidectomy. Before the surgery, the surgeon must check/ do - \nSelect and explain. \nA. Serum Calcium levels, B. Serum PTH assay, C. Indirect Laryngoscopy, D. Iodine 131 scan', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Indirect Laryngoscopy o Nerve Damage to recurrent/superior laryngeal nerve is a known complication of thyroidectomy. Hence it is important to document the state of the vocal cords before surgery to prevent litigation liability", 'role': 'assistant'}]