## **Core Concept**
The question tests the understanding of food poisoning and the typical incubation periods of various foodborne pathogens. The key detail here is the short incubation period of 3 hours between food consumption and the onset of symptoms.

## **Why the Correct Answer is Right**
The correct answer, **Staphylococcus aureus**, is known for causing food poisoning with a short incubation period, typically within 1-6 hours after consumption of contaminated food. This organism produces heat-stable enterotoxins that can cause rapid onset of symptoms such as vomiting, diarrhea, and abdominal cramps.

## **Why Each Wrong Option is Incorrect**
- **Option A:** *Salmonella* infections usually have a longer incubation period, typically ranging from 6 hours to 6 days, making it less likely in this scenario.
- **Option B:** *Escherichia coli* (E. coli) infections, particularly those caused by enterotoxigenic E. coli (ETEC), have a variable incubation period but often present with diarrhea as a primary symptom rather than immediate vomiting.
- **Option C:** *Clostridium perfringens* causes food poisoning with an incubation period of 8-22 hours, which is longer than the 3 hours described.
- **Option D:** While not provided, any other option not associated with a short incubation period would also be incorrect.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **Staphylococcus aureus** food poisoning is often associated with improperly handled or stored food, particularly in settings like picnics or buffet-style meals where food may be left at room temperature for extended periods. This scenario fits with the history provided.

## **Correct Answer:** B. Staphylococcus aureus