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: Unknown
N-acetyl cysteine replenishes intracellular levels of 
Select and explain. 
A. Sodium, B. Potassium, C. Glutathione, D. None of the above
C: Glutathione
Answer: C: Glutathione 
Explanation: None