A pt.is brought to the casualty in the state of altered sensorium.He was on lithium t/t for affective disorder and has suffered through an attack of epileptic fits.On examination he has tremors increased DTR's and incontinence of urine.He has also undergone an episode of severe gastroenteritis 2 days ago.The serum lithium was found to be 1.95 m moles/L.The cause of her condition is:

• A. Lithium toxicity
• B. Dehydration
• C. Manic episode
• D. Depressive stupor