This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
All are growth promoting oncogenes except - 
Select and explain. 
A. FGF, B. TGF-a, C. TGF-b, D. PDGF
C: TGF-b
Answer: C: TGF-b 
Explanation: Robbins basic pathology 9th edition page no 187 TGF b can function to prevent or promote tumor growth, depending on the state of other genes in the cell.