<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 5-year-old boy is brought to the emergency department because of a generalized pruritic rash for 14 hours. Five days ago, he had pink eyes that resolved spontaneously. He has acute lymphoblastic leukemia. He has received 3 cycles of chemotherapy with vincristine, asparaginase, dexamethasone, and doxorubicin. His last treatment cycle was 2 weeks ago. The patients other medications include multivitamin supplements. His temperature is 38C 100.4F, pulse 90min, and blood pressure is 10565 mm Hg. Examination of the skin shows multiple crops of macules and papules over the face, trunk, and extremities. There are also excoriation marks and crusted lesions. The remainder of the examination shows no abnormalities. Which of the following is the most appropriate next step in the treatment of this patient?? A: Vitamin A administration, B: Immunoglobulin administration, C: Symptomatic therapy, D: Acyclovir administration, E: Penicillin V administration,  <response>: This is a clinical vignette about a 5-year-old boy with acute lymphoblastic leukemia who is brought to the ED with a generalized pruritic rash after having pink eye 5 days ago. He is on chemotherapy. The description of the rash with macules, papules, excoriations and crusting is consistent with varicella zoster virus VZV infection. The history of pink eye 5 days ago suggests this was a prodromal symptom, and VZV typically causes a vesicular rash. Immunocompromised patients are at risk for disseminated VZV. The treatment options include vitamin A, immunoglobulin, symptomatic therapy, acyclovir, and penicillin V. Acyclovir is an antiviral medication that treats VZV infections, so it is the most appropriate treatment.D: Acyclovir administration 