What type of drug can lead to increased aggressiveness and libido in men?

Anabolic steroids are synthetic derivatives of the male sex hormone testosterone. These substances can significantly influence various physiological processes, including those related to muscle growth and physical performance. One of the notable effects of anabolic steroid use is an increase in aggressiveness, often referred to as "roid rage," which can lead to heightened feelings of irritability and hostility. Additionally, these steroids can enhance libido in men due to their androgenic effects, which can increase sexual drive.

The other choices do not typically lead to increased aggressiveness and libido. Stimulants can elevate energy levels and alertness but do not specifically target libido or aggressiveness in the same way. Beta-blockers are commonly used to manage anxiety and cardiovascular issues, and they may actually reduce performance-related anxiety rather than increase aggressiveness. Diuretics are primarily used to expel excess fluid from the body and do not have a direct impact on aggressiveness or libido. Thus, the clear connection of anabolic steroids to increased aggressiveness and libido makes them the correct answer.