Neuroleptics cause hyperprolactinemia by blocing the effect of following on pituitary lactotropes-
Ans. is 'a' i.e., Dopamine * Neuroleptics consistently increase prolactin release by blocking the inhibitory action of DA on pituitary lactotropes. This may result in galactorrhoea and gynaecomastia.
Dopamine
Glycine
Acetylcholine
Serotonin
C.N.S