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
Feaures of medullary carcinoma thyroid: 
Select and explain. 
A. Arises from parafollicular cells, B. Amyloid stroma is present on histology, C. Diarrhea occurs, D. All
D: All
Answer: D: All 
Explanation: Ans is All "Some tumours are familial, possibly accounting for 10-20% of all cases."- Bailey Total Thyroidectomy is the treatment of choice for patients with MTC because of high incidence of multicentricity, the more aggressive course and RAI therapy usually being not effective.