This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
N Acetyl Cysteine replenishes: 
Select and explain. 
A. Glutathione, B. Glycine, C. Glutamate, D. GABA
A: Glutathione
Answer: A: Glutathione 
Explanation: Ans. A. GlutathioneThe active part of both Glutathione and N Acetyl Cysteine is Sulfhydryl group of Cysteine. So N Acetyl Cysteine replenishes Glutathione.