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
[{'content': 'Follicular carcinoma of thyroid is due to mutation of:- \nSelect and explain. \nA. RAS, B. HGF, C. RET, D. ABL', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Genes implicated in FCT; p53, PTEN, RAS, PAX8/PPAR .', 'role': 'assistant'}]