<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 40-year-old man is bitten by a copperhead snake, and he is successfully treated with sheep hyperimmune Fab antivenom. Six days later, the patient develops an itchy abdominal rash and re-presents to the emergency department for medical care. He works as a park ranger. His medical history is significant for gout, hypertension, hypercholesterolemia, diabetes mellitus type II, and multiple basal cell carcinomas on his face and neck. He currently smokes 1 pack of cigarettes per day, drinks a 6-pack of beer per day, and currently denies any illicit drug use. His vital signs include: temperature 40.0C 104.0F, blood pressure 12674 mm Hg, heart rate 111min, and respiratory rate 23min. On physical examination, his gait is limited by diffuse arthralgias, and he has clear breath sounds bilaterally and normal heart sounds. There is also a pruritic abdominal serpiginous macular rash which has spread to involve the back, upper trunk, and extremities. Of the following options, which best describes the mechanism of his reaction?? A: Type Ianaphylactic hypersensitivity reaction, B: Type IIcytotoxic hypersensitivity reaction, C: Type IIIimmune complex-mediated hypersensitivity reaction, D: Type IVcell-mediated delayed hypersensitivity reaction, E: Type I and IVmixed anaphylactic and cell-mediated hypersensitivity reactions,  <response>: This is a question about hypersensitivity reactions. The patient developed a rash 6 days after being treated with antivenom for a copperhead snake bite. The rash is described as pruritic, serpiginous, and macular, and has spread to involve the back, upper trunk, and extremities. Based on the delayed onset of the rash 6 days after antivenom treatment, the morphology of the rash, and the systemic symptoms like arthralgias, this is most consistent with a type III hypersensitivity reaction. Type III reactions involve immune complex deposition and complement activation, leading to symptoms like rash, joint pain, fever, and malaise on a delayed timeframe after antigen exposure.Type I reactions are immediate IgE-mediated allergic reactions like anaphylaxis. Type II reactions involve antibodies against cell surface antigens. Type IV reactions are delayed-type hypersensitivity mediated by T cells, such as contact dermatitis. The time course and symptoms here are not consistent with types I, II, or IV.C: Type IIIimmune complex-mediated hypersensitivity reaction 