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': 'All the following are true about piedra except \nSelect and explain. \nA. Piedra is nodule formation on hair shaft, B. White piedra is caused by piedrae hortae, C. Piedrae hortae is a phaeoid fungus, D. Piedrae hortae produces reddish brown colonies', 'role': 'user'}, {'content': 'Answer: B \nExplanation: White piedra is caused by Trichosporon beigelli', 'role': 'assistant'}]