This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Gland, Subject name: Surgery
[{'content': 'Thyroid carcinoma secreting ACTH \nSelect and explain. \nA. Follicular ca, B. Medullary ca, C. Papillary ca, D. Anaplastic ca', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Medullary caMedullary Cancer Thyroid:* 5% of thyroid cancers* Arises from Parafollicular C cells which are derived from Ultimobranchial Bodies.* Mc Site is supero lateral* C cells secrete CALCITONIN* Secretes ACTH, Serotonin, Calcitonin, CEA, Histaminidases, PG E2 and PGF2 Alpha.* FNAC showing amyloid is diagnostic', 'role': 'assistant'}]