This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
True about Nitric Oxide are all except: 
Select and explain. 
A. Produced from arginine, B. Nitric oxide synthase has three isoforms, C. Otherwise called endothelium derived relaxing factor, D. Acts through c AMP
D: Acts through c AMP
Answer: D: Acts through c AMP 
Explanation: Ans. D. Acts through cAMPNitric Oxide acts through cGMPFormed from ArginineiNOS, eNOS, nNOS are three isoforms of Nitric Oxide SynthaseNitric OxideUncharged molecule having an unpaired electron, so it is highly reactive, free radical.Very short half life (0.1 seconds)Formerly called Endothelium Derived Relaxing Factor.Gaseous molecule.Second messenger is cGMP.Functions of Nitric OxidePotent Vasodilator.Involved in Penile erectionNeurotransmitter in brain and Peripheral Nervous System.Low level of NO involved in Pylorospasmin Congenital Hypertrophic Pyloric Stenosis.Inhibit adhesion, activation and aggregation of Platelets.