<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:An 18-year-old man is brought to the emergency department by his girlfriend because of a pruritic rash on his penis that has been present for the past hour. The rash developed shortly after the patient had protected sexual intercourse with his girlfriend for the first time. His girlfriend does not have any symptoms. Five days ago, the patient visited a friend who was complaining of intense pruritus on her elbows, wrists, groin, and axillae. The friend subsequently underwent treatment that required her to wash her bedding, clothing, and towels in hot water. Two years ago, the patient developed an itchy rash around his mouth after blowing up balloons at a birthday party. He is breathing comfortably. Vitals signs are within normal limits. Examination shows multiple well-circumscribed, raised, erythematous plaques with mild excoriations that extend from the base to the glans of the penis. The remainder of the examination shows no abnormalities. Administration of which of the following is the most appropriate next step in management?? A: Intravenous acyclovir, B: Oral cromolyn sodium, C: Subcutaneous epinephrine, D: Oral famotidine, E: Oral cetirizinen,  <response>: This is a patient with an acute pruritic rash on his penis that developed after protected sexual intercourse. The description of the rash as well-circumscribed, raised, erythematous plaques is consistent with urticaria hives. The patient has a history of a similar rash after exposure to latex balloons, suggesting latex allergy. His friend recently had a pruritic rash suggestive of scabies, but the patients rash does not have the typical morphology or distribution of scabies. There are no signs of anaphylaxis or angioedema. The most likely diagnosis is acute urticaria triggered by latex exposure from the condom. Oral antihistamines like cetirizine are first-line treatment for acute urticaria. Epinephrine may be indicated for anaphylaxis but is not warranted here. Acyclovir is used for herpes infections but the rash does not fit herpes morphology. Cromolyn prevents mast cell degranulation but is not first-line for acute urticaria. Famotidine reduces gastric acid but does not treat urticaria.E: Oral cetirizine 