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: Pathology
All are true regarding medullary carcinoma of thyroid except - 
Select and explain. 
A. It arises from C cells, B. Secrete high levels of calcitonin, C. It is dependent on TSH, D. Most cases are familial
C: It is dependent on TSH
Answer: C: It is dependent on TSH 
Explanation: . It is dependent on TSH