<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 6-year-old male who recently immigrated to the United States from Asia is admitted to the hospital with dyspnea. Physical exam reveals a gray pseudomembrane in the patients oropharynx along with lymphadenopathy. The patient develops myocarditis and expires on hospital day 5. Which of the following would have prevented this patients presentation and decline?? A: Increased CD4 T cell count, B: Secretory IgA against viral proteins, C: Increased IgM preventing bacterial invasion, D: Circulating IgG against AB exotoxin, E: Improved IgE release from mast cells,  <response>: This is a clinical vignette describing a 6-year-old male patient who recently immigrated from Asia and presented with respiratory symptoms and oropharyngeal pseudomembranes. He later developed myocarditis and died. The question asks which of the listed immune factors would have prevented his presentation and decline.Based on the description, this patient likely had diphtheria, an upper respiratory bacterial infection caused by Corynebacterium diphtheriae. Diphtheria can be prevented by vaccination, which works by generating circulating IgG antibodies against the diphtheria toxin. Therefore, the correct answer is D.Choices A, B, and C describe components of the immune system that would not specifically protect against diphtheria. Choice E relates to allergy rather than this infectious process.D: Circulating IgG against AB exotoxin 