This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Out of 20 children that went to a party, 11 developed abdominal pain, diarrhea with nausea and vomiting around 6 hours after food intake. Most likely causative agent: 
Select and explain. 
A. Rotavirus, B. Staphylococcus, C. Streptococcus, D. Clostridium perfringens
B: Staphylococcus
Answer: B: Staphylococcus 
Explanation: Bacterial Food PoisoningIncubation period, organismSymptomsCommon sources1-6 HStaphylococcus aureusNausea, vomiting, diarrheaHam, poultry, potato or egg salad, mayonnaise, cream pastriesBacillus cereusNausea, vomiting, diarrheaFried rice8-16 HClostridium perfringensAbdominal cramps, diarrhea (vomiting rare)Beef, poultry, legumes, graviesB. cereusAbdominal cramps, diarrhea (vomiting rare)Meats, vegetables, dried beans, cereals> 16 HVibrio choleraeWatery diarrheaShellfishEnterotoxigenic Escherichia coliWatery diarrheaSalads, cheese, meats, waterEnterohemorrhagic E. coliBloody diarrheaGround beef, roast beef, salami, raw milk, raw vegetables, apple juiceSalmonella spp.Inflammatory diarrheaBeef, poultry, eggs, dairy productsCampylobacter jejuniInflammatory diarrheaPoultry, raw milkShigella sppDysenteryPotato or egg salad, lettuce, raw vegetablesVibrio parahaemolyticusDysenteryMollusks, crustaceans