This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Tumor, Subject name: Pathology
Which of the following is not a feature of Papillary carcinoma of thyroid? 
Select and explain. 
A. Rearrangement of RET gene, B. Rearrangement of NTRK1 gene, C. Mutation of BRAF gene, D. Mutation of RAS gene
D: Mutation of RAS gene
Answer: D: Mutation of RAS gene 
Explanation: Most papillary carcinomas have gain-of-function mutations or rearrangements involving: RET gene NTRK1 receptor tyrosine kinases Serine/threonine kinase BRAF, which is component of MAPK pathway. RAS mutations are seen in follicular carcinoma of thyroid.