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: Surgery
Which of the following pathogens are associated with watery diarrhea after an incubation period of 8 to 14 hours? 
Select and explain. 
A. Rotavirus and Norwalk virus, B. Shigella and Salmonella, C. S. aureus and Bacillus cereus, D. Bacillus cereus and Clostridium perfringens
D: Bacillus cereus and Clostridium perfringens
Answer: D: Bacillus cereus and Clostridium perfringens 
Explanation: Bacillus cereus and Clostridium perfringens Bacillus cereus strains can produce two different toxins: a heat stable toxin that can lead to an illness after 2 to 7 hours and a heat-labile toxin that causes disease manifestations 8 to 14 hours after ingestion. The syndrome of Clostridium perfringens diarrhea usually occurs 8 to 14 hours after ingestion of the preformed toxin.