The answer is: " dopamine " .
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B seems like the most reasonable answer.
HIV or infection in the immune system
The five healthy lifestyle include : 1) A healthy diet
2) Being physically active (walking/bicycling ≥40 min/day and exercising ≥1 h/week)
3) Healthy waist circumference (waist circumference <95 cm or 37.4 inches)
4) Moderate alcohol consumption (10 to 30 g/day)
5) No smoking
