Which statement accurately describes the roles of dopamine and serotonin?

• A. Dopamine regulates mood; Serotonin regulates sleep only
• B. Dopamine is involved in memory; Serotonin is a hormone
• C. Dopamine is linked to reward/motivation; Serotonin to mood and wellbeing
• D. Dopamine acts as a hormone; Serotonin as a digestive enzyme

Answer: (C)

Dopamine mostly acts as the brain’s reward and motivation signal. When you experience something rewarding or anticipate a goal, dopamine pathways reinforce the behavior and help you learn to repeat it, which is why it’s strongly tied to motivation and reward processing. Serotonin, by contrast, plays a broader role in regulating mood and overall sense of wellbeing, influencing emotional state, mood stability, and factors like sleep and appetite. So the description that dopamine is linked to reward and motivation and serotonin to mood and wellbeing captures these central roles. The other statements mix up these functions or mischaracterize them, since dopamine isn’t defined primarily as mood regulation alone, serotonin isn’t simply a sleep regulator, and both are neurotransmitters rather than hormones or digestive enzymes.