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
Following serum levels are suggestive of lithium toxicity 
Select and explain. 
A. 2 mEq/L, B. 4 mEq/L, C. 6 mEq/L, D. 8 mEq/L
A: 2 mEq/L
Answer: A: 2 mEq/L 
Explanation: Ans. a. 2 mEq/L