This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Food poisoning with incubation period less than 6 hours is due to - \nSelect and explain. \nA. V. Cholerae, B. Bacillus cereus, C. Clostridium prefringens, D. Salmonella', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bacillus cereus produces at least 2 distinct enterotoxins, causing two distinct form of food poisoning. Emetic form : incubation period - 1-6 hrs Diarrhoeal form: incubation period - 12-24 hrs V.chloerae - incubation period - commonly 1-2 days Clostridium perfringens -incubation period - 6-24 hrs Salmonella - incubation period - 12-24 hrs Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page 239', 'role': 'assistant'}]