In depression , there is deficiency of:: (A) 5-HT, (B) Acetylcholine, (C) Dopamine, (D) GABA
Answer is A. Ref: Katzung 14th ed. Monoamines like serotonin and nor-adrenaline are deficient in depressive patients, therefore reuptake inhibitors of these monoamines are used for treatment of depression.