This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and Reproduction, Subject name: Physiology
Insulin acts by which pathway- 
Select and explain. 
A. Tyrosin kinase, B. JAK-STAT-Kinase, C. Transcription factor, D. Intrinsic ion channel
A: Tyrosin kinase
Answer: A: Tyrosin kinase 
Explanation: Ans. is 'a' i.e., Tyrosin kinase