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': 'Which fungal infection is commonest to occur in neutropenia - \nSelect and explain. \nA. Candida, B. Histoplasma, C. Aspergillus niger, D. Aspergillus fumigatus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]