In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

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).
2