Addiction, dependence and tolerance

A scientist is testing the effects of heroin on monkeys. The table below lists the details of drug treatment on

4

different monkeys.

Details	Monkey $1$ ‍	Monkey $2$ ‍	Monkey $3$ ‍	Monkey $4$ ‍
Number of doses delivered per day	$5$ ‍	$3$ ‍	$1$ ‍	$0$ ‍

After a few days, the scientist tests the tolerance levels of each monkey to heroin. She delivers

2

doses of heroin to each monkey and tests their responses.

Which of the 4 monkeys will respond to this test?

Class 12 Biology (India)