You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "an agent that causes the pupil to dilate is called?" whose answer is Mydriasis.
Each document should contain about 30 words, and these documents should contain useful information.

Query: substance that causes pupil dilation
Useful Output:

Doc 1: What recreational drugs cause dilated pupils? · Cocaine. · Ecstasy (MDMA). · LSD. · Methamphetamines. · Psychedelic mushrooms.
Doc 2: Which Prescription Drugs Dilate Pupils · Amphetamines or methamphetamines · Cocaine or crack · Hallucinogens such as LSD or mushrooms · Opiates
Doc 3: What Drugs Cause Dilated Pupils? · Ecstasy · LSD · Cocaine · Crack Cocaine · MDMA · Crystal Meth · Ketamine · Mescaline. People may also become
Doc 4: Psychoactive substances like MDMA (Ecstasy), LSD, psilocybin (magic mushrooms), and cocaine typically cause mydriasis. This dilation occurs due
Doc 5: 10 Drugs That Dilate Pupils · Antihistamines. · Benzodiazepine. · Cocaine. · Ketamine. · LSD. · Marijuana. · Methamphetamine/amphetamines.