Which of the following categories can cause pupil dilation?

Pupil dilation, also known as mydriasis, can be caused by several factors, including certain categories of drugs. Hallucinogens are known to affect the central nervous system and influence sensory perception, which can lead to physiological changes such as pupil dilation. This effect is particularly pronounced with hallucinogens such as LSD, psilocybin, or mescaline, which stimulate receptors in the brain that alter visual perception and can cause widening of the pupils.

Other categories mentioned, like alcohol and anti-inflammatories, generally do not cause significant pupil dilation. Alcohol might have some impact on pupil size but more often leads to constriction in certain doses and can impair overall function momentarily, while anti-inflammatories and aspirin do not commonly influence pupil size at all. Therefore, hallucinogens remain the primary category associated with this specific physiological response.