<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 20-year-old man visits the clinic for a regular follow-up appointment. Patient says he has been experiencing dry mouth and flushing of his skin for the past few days. He also feels tired and sleepy most of the time. Past medical history is significant for a skin rash a couple weeks ago after eating strawberries, for which he has prescribed a medication that he is still taking. Which of the following is the most likely etiology of this patients symptoms?? A: Activation of alpha-1 adrenergic receptors, B: Activation of parasympathetic receptors, C: Inhibition of alpha-1 adrenergic receptors, D: Inhibition of parasympathetic receptors, E: Inhibition of histamine receptors,  <response>: Based on the information provided in the question stem, the patient is experiencing symptoms of dry mouth, flushing, fatigue, and sleepiness. He also has a history of a recent allergic skin reaction to strawberries that he is still taking medication for. The symptoms of dry mouth, flushing, and fatiguesleepiness indicate an anticholinergic toxidrome likely due to the medication he is taking for his allergic reaction. Anticholinergic medications block parasympathetic activity, leading to dry mouth, flushing, urinary retention, constipation, tachycardia, and drowsiness. Of the choices provided, inhibition of parasympathetic receptors best explains his current symptoms. Activation of alpha-1 adrenergic receptors would cause mydriasis, hypertension, reflex bradycardia. Activation of parasympathetic receptors would cause the opposite symptoms - lacrimation, salivation, miosis, bradycardia. Inhibition of alpha-1 adrenergic receptors would cause hypotension, bradycardia. Inhibition of histamine receptors may improve allergic symptoms but would not cause his anticholinergic symptoms.D: Inhibition of parasympathetic receptors 