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
[{'content': 'In case of Adenomatoid goitre which carcinoma is commonest to occur - \nSelect and explain. \nA. Medullary Ca, B. Follicular Ca, C. Papillary Ca, D. Anaplastic Ca', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "An increased incidence of cancer (usually follicular) has been reported from endemic areas. Dominant or rapidly growing nodules in longstanding goitres should always be subjected to aspiration cytology." - Bailey & Love', 'role': 'assistant'}]