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
Which is the most common oncogene involved in human cancer? 
Select and explain. 
A. RET, B. RAS, C. RB, D. pS3
B: RAS
Answer: B: RAS 
Explanation: RAS is a signal transduction protein. It is the most common oncogene mutation involved in human cancer.