This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
[{'content': 'A patient with multinodular goitre suddenly developed pain and difficulty in breathing. Which of the following types of thyroid carcinoma is most likely to cause this complication ? \nSelect and explain. \nA. Papillary carcinoma, B. Follicular carcinoma, C. Medullary carcinoma, D. Anaplastic carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A painful nodule, sudden appearance, or rapid enlargement of a nodule raises suspicion of carcinoma (usually follicular) but is usually due to haemorrhage into a simple nodule Dominant or rapidly growing nodules in long-standing goitres should always be subjected to aspiration cytology. Source Bailey and Love 26th edition Pg : 748', 'role': 'assistant'}]