<prompt> A 22 year old man had a Beef sandwich and Potato salad. He Vomited 2 hours after the meal. What is the probable diagnosisS. aureus poisoningBacillus cereus poisoningClostridial poisonongHelicobacter pylori poisoning  <response>: Preformed toxin of S. aureus causes nausea within 1-6 hours of ingestion.Common food associated are: Poultry, potato and egg salad. 