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: Microbiology
A child is presenting with vomiting and abdominal pain after 5 hours of eating some food. The most likely causative organism 
Select and explain. 
A. Bacillus cereus, B. C. perfringens, C. Cl. Botulinum, D. V. cholerae
A: Bacillus cereus
Answer: A: Bacillus cereus 
Explanation: → Food poisoning presenting within 6 hours is seen:

Staph aureus and
B. cereus.

→ Cl. Botulinum causes constipation (not diarrhea) and the incubation period is about 18-24 hours.
→ V. cholerare has incubation period > 16 hours.