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
Fibrosis is due to ? 
Select and explain. 
A. TGF beta, B. TNF alpha, C. IL 7, D. IL l0
A: TGF beta
Answer: A: TGF beta 
Explanation: Ans. is 'a' i.e., TGF beta