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: Medicine
Grwoth factors promote cell growth by acting on - 
Select and explain. 
A. C. AMP, B. Tyrosine Kinase, C. C.GMP, D. TRM
B: Tyrosine Kinase
Answer: B: Tyrosine Kinase 
Explanation: None