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 statements are true regarding Clostridium perfringens except - \nSelect and explain. \nA. Infant botulism is caused by ingestion of preformed toxin, B. Clostridium botulinum A, B, C and F cause human disease, C. The gene for botulinum toxin is encoded by a bacteriophage, D. Clostridium baratii may cause botulism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]