This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'A child is presenting with vomiting and abdominal pain after 5 hours of eating some food. The most likely causative orgonism: \nSelect and explain. \nA. Bacillus cereus, B. Cl. perfringens, C. Cl. botalinum, D. V. cholerae', 'role': 'user'}, {'content': 'Answer: A \nExplanation: M/C cause of food poisoning. Chinese fries rice is major source of the organism. REF : ananthanarayana 10th ed', 'role': 'assistant'}]