This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Pharmacology
A psychiatric patient taking medication develops tremor, thyroid enlargement and leukocytosis. Drug implicated is: 
Select and explain. 
A. Clomipramine, B. Haloperidol, C. Lithium, D. Olanzapine
C: Lithium
Answer: C: Lithium 
Explanation: Ans. C. LithiumLithium is mood stabilizer which is drug of choice for bipolar syndrome. It causes tremor, nephrotoxicity, hypothyroidism and Ebstein anomaly. Typical antipsychotics like haloperidol causes EPS and atypical antipsychotics weight gain, hyperglycemia.