This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'A 43-year-old man suddenly develops odynophagia. Which organism is most likely to be isolated on throat culture? \nSelect and explain. \nA. Mononucleosis, B. S. aureus, C. Normal pharyngeal flora, D. Group A streptococci', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]