<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 10-year-old boy is brought to the pediatric clinic because of a sore throat of 1-week duration. He also has a cough and fever. He has pain when swallowing and sometimes water regurgitates from his nose when drinking. He was diagnosed with acute tonsillitis by his primary care physician 1 month ago, for which he received a week-long course of amoxicillin. His immunization status is unknown as he recently moved to the US from Asia. On examination, he is alert and oriented to time, place, and person. On inspection of his oral cavity, an edematous tongue with a grey-white membrane on the soft palate and tonsils is noted. The neck is diffusely swollen with bilateral tender cervical lymphadenopathy. Which of the following is the cause of this patients condition and could have been prevented through vaccinations in childhood?? A: Streptococcus pyogenes, B: Corynebacterium diphtheriae, C: Haemophilus influenzae b, D: Agranulocytosis, E: Epstein Barr virus,  <response>: This is a clinical vignette about a 10-year-old boy with a sore throat, cough, fever, pain with swallowing, and regurgitation of fluids through the nose. He was recently diagnosed with acute tonsillitis and treated with amoxicillin. He has an unknown vaccination history since he recently moved from Asia. On exam he has an edematous tongue with grey-white membranes on the tonsils and soft palate, swollen neck, and tender lymphadenopathy. The question asks which of the answer choices is the likely cause of his condition and could have been prevented by childhood vaccinations. Based on the clinical presentation of throat membranes and swollen neck, the most likely diagnosis is diphtheria caused by Corynebacterium diphtheriae. Diphtheria can be prevented by the DTaP vaccine given in childhood. Therefore, the answer is B.B: Corynebacterium diphtheriae 