<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 33-year-old man comes into the urgent care clinic with an intensely itchy rash on the bilateral mid-lower extremities, with a fine linear demarcation approximately an inch above his socks. The rash is arranged in streaks of erythema with superimposed vesicular lesions. The patient states that he recently began hiking in the woods behind his house, but he denies any local chemical exposures to his lower extremities. His vital signs include: blood pressure of 12776, heart rate of 82min, and respiratory rate of 12min. Of the following options, which is 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 III and IVmixed immune complex and cell-mediated hypersensitivity reactions,  <response>: Based on the description, this patient has a rash localized to the lower extremities in a distinct linear pattern, with erythema, vesicles, and intense itching. The rash occurred after hiking in the woods, suggesting an exposure while hiking triggered this reaction. The vital signs are normal. These features are most consistent with a delayed type IV hypersensitivity reaction, likely to something he contacted while hiking such as poison ivy. The localized non-systemic nature makes types I, II, and III reactions unlikely. The vesicles and itching fit poison ivy exposure.D: Type IVcell-mediated delayed hypersensitivity reaction 