This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Food poisoning case with diarrhea within 6 hours- 
Select and explain. 
A. Staph aureus, B. Cl. perfringens, C. Cl. botulinum, D. V. cholerae
A: Staph aureus
Answer: A: Staph aureus 
Explanation: None