This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'In depression , there is deficiency of: \nSelect and explain. \nA. 5-HT, B. Acetylcholine, C. Dopamine, D. GABA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]