This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Amyloid like stroma is seen in- 
Select and explain. 
A. Papillary tumor, B. Follicular tumor, C. Medullary tumor, D. Anaplastic tumor
C: Medullary tumor
Answer: C: Medullary tumor 
Explanation: harshmohan textbook of pathology 7th edition. *most medullary carcinoma of thyroid have amyloid deposits in stroma which stains positively with Congo red.the amyloid deposits are believed to represents stored calcitonin derived from the neoplastic C cells in the form of pro hormone.