<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 3-year-old male is brought to the ER with a sore throat and fever. Examination of the pharynx reveals a dark, inflammatory exudate. Cysteine-tellurite agar culture produces black, iridescent colonies. Microscopic features of the causal organism most likely include which of the following?? A: Serpentine growth patterns, B: Metachromic granules, C: Lancet-shape, D: Long, branching filaments, E: Kidney-bean shaped rod,  <response>: This is a medical microbiology question asking about the identification of a bacterial organism based on clinical presentation and laboratory findings. The key details are:- 3 year old male with sore throat and fever - suggests possible bacterial pharyngitis- Dark inflammatory exudate on pharynx exam - suggests possible diphtheria - Black, iridescent colonies on cysteine-tellurite agar - this is selective for Corynebacterium diphtheriae- Asking for microscopic morphology of the organismThe choices describe different bacterial shapes and features. Serpentine suggests a curved rod shape, metachromic granules are typical of Corynebacterium diphtheriae, lancet-shape suggests Streptococcus, long branching filaments suggests Actinomyces or Nocardia, kidney bean rod suggests Enterobacteriaceae like E. coli.Based on the clinical presentation and positive culture, Corynebacterium diphtheriae is most likely. The microscopic morphology would show metachromic granules.B: Metachromic granules 