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: Microbiology
Stool examination is required for diagnosis of infection with 
Select and explain. 
A. Staphylococcus aureus, B. Clostridia, C. Shigella, D. Campylobacter
A: Staphylococcus aureus
Answer: A: Staphylococcus aureus 
Explanation: In Staph food poisoning, Enterotoxin is responsible for the manifestations of food poisoning - nausea, vomiting and diarrhoea 2-6 hours after consuming food contaminated by the preformed toxin. The source of infection is usually food handler who is a carrier. In food poisoning, faeces and remains of suspected food should be collected. Ref: Ananthanarayan and Paniker&;s Textbook of Microbiology, 9th edition; pg no: 204