Final answer:
Among the substances listed, alcohol is a diuretic because it inhibits the release of ADH, leading to increased urine production.
Step-by-step explanation:
A diuretic is a substance that promotes the increase of urine output, thus decreasing water retention in the body. Out of the options provided, alcohol is known to be a diuretic. Alcohol acts as a diuretic by inhibiting the release of antidiuretic hormone (ADH), which in turn lessens water reabsorption in the kidneys and increases urine volume. This is why consuming alcoholic beverages can lead to an increase in urination.