<prompt> A 43-year-old man suddenly develops odynophagia. Which organism is most likely to be isolated on throat culture?MononucleosisS. aureusNormal pharyngeal floraGroup A streptococci  <response>: Odynophagia is a sensation of sharp retrosternal pain on swallowing. It is usually caused by severe erosive conditions such as Candida, herpes virus, and corrosive injury following caustic ingestion. 