This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Malignancies, Subject name: Surgery
[{'content': 'Persistent multinodular goiter may cause - \nSelect and explain. \nA. Follicular Carcinoma, B. Pappilary Carcinoma, C. Medullary Carcinoma, D. Colloid Carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Follicular Carcinoma "An increased incidence of cancer (usually follicular) has been reported from endemic areas. Dominant or rapidly growing nodules in longstanding goiters should always be subjected to aspiration cytology." - Bailey & Love', 'role': 'assistant'}]