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: Biochemistry
[{'content': 'Which of the following has cyclic GMP as a second messenger ? \nSelect and explain. \nA. Growth hormone, B. FSH, C. Insulin, D. Thyroxin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Insulin action in ceain tissues are mediated through CGMP which activates protein kinase. Cyclic GMP is synthesized from the nucleotide GTP using the enzyme guanylyl cyclase. Cyclic GMP also serves as the second messenger for the following Atrial natriuretic peptide (ANP) Nitric oxide (NO) The response of the rods of the retina to light. Some of the effects of cGMP are mediated through Protein Kinase G (PKG).', 'role': 'assistant'}]