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
[{'content': 'The following statement are true regarding botulism except : \nSelect and explain. \nA. Infant botulism is caused by ingestion of preformed toxin, B. Cl botulinum A, B, E and F cause human disease, C. The gene for botulinum toxin is coded by bacteriophage, D. Cl. baratii may cause botulism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]