<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 60-year-old man presents to the office for a scheduled follow-up visit. He has had hypertension for the past 30 years and his current anti-hypertensive medications include lisinopril 40 mgday and hydrochlorothiazide 50 mgday. He follows most of the lifestyle modifications recommended by his physician, but is concerned about his occasional occipital headaches in the morning. His blood pressure is 16098 mm Hg. The physician adds another drug to his regimen that acts centrally as an α2-adrenergic agonist. Which of the following second messengers is involved in the mechanism of action of this new drug?? A: Cyclic adenosine monophosphate, B: Cyclic guanosine monophosphate, C: Inositol triphosphate, D: Diacylglycerol, E: Calcium ions,  <response>: This is a clinical vignette about a 60-year-old man with longstanding hypertension who is not adequately controlled on his current medications lisinopril and hydrochlorothiazide. He is now prescribed a centrally acting alpha-2 adrenergic agonist as an additional antihypertensive. The question asks about the second messenger involved in the mechanism of action of alpha-2 agonists. Alpha-2 agonists work by activating alpha-2 adrenergic receptors which are coupled to inhibitory G proteins. Activation of these G protein-coupled receptors leads to inhibition of adenylyl cyclase and decreased production of cyclic AMP.So of the answer choices provided, cyclic AMP is the second messenger involved in the mechanism of action of alpha-2 agonists like the drug added in this patient.A: Cyclic adenosine monophosphate 