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: Pathology
Prolonged administration of broad spectrum antibiotics results in the formation of: 
Select and explain. 
A. Black hairy tongue, B. Median rhomboid glossitis, C. Geographic tongue, D. Fissured tongue
A: Black hairy tongue
Answer: A: Black hairy tongue 
Explanation: None