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': 'All of the following statements about Botulism are true except - \nSelect and explain. \nA. Botulism is caused by endotoxin, B. Honey ingestion causes infant botulism, C. Constipation is seen, D. Detection of antitoxin in the serum can aid in diagnosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]