<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 4-year-old boy presents to the Emergency Department with wheezing and shortness of breath after playing with the new family pet. Which of the following immunological factors is most involved in generating the antibodies necessary for mast cell Fc-receptor cross-linking and degranulation?? A: IL-2, B: IL-4, C: IL-5, D: IL-10, E: IL-13,  <response>: This question is asking about the immunological factors involved in an allergic reaction that leads to mast cell degranulation and release of histamine and other inflammatory mediators. The key details in the stem are a 4 year old with wheezing and shortness of breath after exposure to a new pet, indicating an IgE-mediated hypersensitivity reaction. Of the interleukin choices given, IL-4 is the main cytokine responsible for promoting IgE production by B cells and stimulating Th2 cells. IL-5 recruits and activates eosinophils but does not directly stimulate IgE production. The other choices do not play a major role in IgE-mediated allergic reactions.B: IL-4 