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
Food poisoning in "Canned food" is usually due to: 
Select and explain. 
A. Staphylococcus, B. Salmonella, C. Clostridia, D. Bacillus cereus
C: Clostridia
Answer: C: Clostridia 
Explanation: Clostridia