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
[{'content': 'Insulin acts by which pathway- \nSelect and explain. \nA. Tyrosin kinase, B. JAK-STAT-Kinase, C. Transcription factor, D. Intrinsic ion channel', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Tyrosin kinase", 'role': 'assistant'}]