Question: Which of the following structural families of drugs act as neuroleptic agents? 
 Options:  <1> Benzothiazepines (diltiazem). <2> Butyrophenones (haloperidol). <3> Phenylpiperidines (pethidine). <4> Aryloxypropanolamines (atenolol). <5> 1,4-dihydropyridines (nifedipine).
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