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
Amyloid stroma is seen in which Ca thyroid ? 
Select and explain. 
A. Papillary Ca, B. Medullary Ca, C. Anaplastic Ca, D. Follicular Ca
B: Medullary Ca
Answer: B: Medullary Ca 
Explanation: Ans is B ie Medullary Ca