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: Pharmacology
Active metabolite of carisoprodol is: 
Select and explain. 
A. Amphetamine, B. Meprobamate, C. Doxylamine, D. Dimethadione
B: Meprobamate
Answer: B: Meprobamate 
Explanation: Meprobamate