This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Incubation period less than few hours 
Select and explain. 
A. Food poisoning, B. Hepatitis A, C. Influenza, D. Rabies
A: Food poisoning
Answer: A: Food poisoning 
Explanation: Incubation period of food poisonings:
Food poisoning - Incubation period
Salmonella - 12 – 24 hours
Staphylococcal - 1 – 6 hours
Botulism - 12 – 36 hours 
Cl. perfirengens - 6 – 24 hours
B. cereus (emetic form) - 1 – 6 hours
B. cereus (diarrhoel form) - 12 – 24 hours