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
In case of a long standing goitre., ca most probable to occur is : 
Select and explain. 
A. Follicular, B. Papillary, C. Anaplastic, D. Medullary
A: Follicular
Answer: A: Follicular 
Explanation: Ans. is 'a' ie follicular "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