This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: ENT
[{'content': 'Otomycosis is most commonly caused by: \nSelect and explain. \nA. Actinomycetes, B. Aspergillus niger, C. Mucor, D. Candida albicans', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Otomycosis/Singapore ear, fungal common causative organism aspergillus niger Other cause - Aspergillus fumigatus Candida albicans c/f - severe itching & hearing, discharge, mild pain o/p - wet blotting paper / wet newspaper appearance of the tympanic membrane Tx - topical antifungal ear drops X 4 weeks aural toilet by micro suction.', 'role': 'assistant'}]