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': 'True statement about diptheria toxin is - \nSelect and explain. \nA. Toxin is phage mediated, B. Toxin is required for local infection, C. Endotoxaemia causes systemic manifestation, D. Toxin acts by inhibiting synthesis of capsule', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]