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
[{'content': 'RAS gene codes for: \nSelect and explain. \nA. Growth factor receptor, B. Cell cycle regulator, C. Signal transduction protein, D. Nuclear transcription factor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: RAS is the most common oncogene mutation involved in human cancer.\nIt codes for signal transduction protein.\nBRAF, ABL, JAK/STAT are other signal transduction proteins involved in neoplasia.', 'role': 'assistant'}]