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: Social & Preventive Medicine
[{'content': 'Ergotism is due to toxic alkaloids produced by fungus \nSelect and explain. \nA. Claviceps purpurea, B. Trichophyton, C. Fusarium species, D. Absidia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]