This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
A 34-year-old woman is at a family picnic where she has a ham sandwich and potato salad. Three hours after the meal, she feels nauseous and throws up.For the above patient with foodborne illness, select the most likely pathogen. 
Select and explain. 
A. Staphylococcus aureus, B. C perfringens, C. Shigella, D. Vibrio parahaemolyticus
A: Staphylococcus aureus
Answer: A: Staphylococcus aureus 
Explanation: The preformed toxin of Staphylococcus causes nausea within 1-6 hours of ingestion. Ham, poultry, potato and egg salad, mayonnaise, and cream pastries are common food sources.