Which stimulant is known to cause physical and psychological dependence?

The correct answer indicates that both caffeine and amphetamines can lead to physical and psychological dependence.

Caffeine, while often perceived as a mild stimulant and widely consumed in beverages like coffee and tea, can cause physical dependence in some individuals. Regular consumption may lead to tolerance, where more of the substance is required to achieve the same effects, and withdrawal symptoms can occur when intake is reduced. These withdrawal symptoms can include headaches, fatigue, irritability, and a depressed mood.

Amphetamines, on the other hand, are a class of stronger stimulants that have a well-documented potential for both physical and psychological dependence. They are often prescribed for conditions like ADHD and narcolepsy, but misuse can lead to significant addiction issues. Users may develop tolerance and experience withdrawal symptoms such as fatigue, depression, and increased appetite when they stop using the drug.

Thus, both substances recognized for their stimulant properties have the potential for dependence, justifying the choice that both caffeine and amphetamines are included in the correct answer.