This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Characteristic of Bacillus cereus food poisoning is: 
Select and explain. 
A. Presence of fever, B. Presence of abdominal pain, C. Absence of vomiting, D. Absence of diarrhoea
B: Presence of abdominal pain
Answer: B: Presence of abdominal pain 
Explanation: Ans. is 'b' i.e., Presence of abdominal painBacillus cereus food poisoning is of two types. Emetic type and Diarrheal type. Abdominal cramps are common feature in both. Other features are:(a) Emetic Type: History of intake of fried rice from Chinese restaurant 6 hours earlier. Mediated by enterotoxin resembling Staphylococcal Enterotoxin.(b) Diarrhoeal Type: History of intake of cooked meat and vegetables 8-16 hours earlier. Mediated by enterotoxin resembling E. coli.