This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mood Disorders, Subject name: Psychiatry
Which of the following drug when combined with Electro-convulsive therapy leads to post ictal delirium 
Select and explain. 
A. Succinylcholine, B. Lithium, C. Desipramine, D. Clozapine
B: Lithium
Answer: B: Lithium 
Explanation: Lithium when combined with ECT Lowered seizure threshold - Prolonged seizures(lasting > 3 min). Results in post-ictal delirium. Doses are withheld for 24 hours prior to treatment