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
A 43-year-old man suddenly develops odynophagia. Which organism is most likely to be isolated on throat culture? 
Select and explain. 
A. Mononucleosis, B. S. aureus, C. Normal pharyngeal flora, D. Group A streptococci
C: Normal pharyngeal flora
Answer: C: Normal pharyngeal flora 
Explanation: 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.