This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycology, Subject name: Microbiology
[{'content': 'Black Piedra is caused by: \nSelect and explain. \nA. Pityrosporum orbiculare, B. Exophiala, C. Trichosporon beigelii, D. Piedraia hoae', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Black piedra Caused by Piedraia hoae Gross-Discrete black, gritty, hard nodules on the hair of the scalp Dx- 10% KOH mount of the crushed nodule reveals dark septate hyphae with club shaped asci, each containing 2-8 ascospores', 'role': 'assistant'}]