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
First active metabolite of chloral hydrate is? 
Select and explain. 
A. Ethanol, B. Dichloroethanol, C. Trichloroethanol, D. Monochloroethanol
C: Trichloroethanol
Answer: C: Trichloroethanol 
Explanation: None