This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid, Subject name: Surgery
Follicular carcinoma of thyroid is due to mutation of:- 
Select and explain. 
A. RAS, B. HGF, C. RET, D. ABL
A: RAS
Answer: A: RAS 
Explanation: Genes implicated in FCT; p53, PTEN, RAS, PAX8/PPAR .