How many milliliters are in one teaspoon?

A teaspoon is a common unit of measurement used in cooking and medicine, and it is equivalent to approximately 5 milliliters. This is a standard conversion used in many recipes and dosage calculations. Understanding this equivalence is crucial, especially in the healthcare field, where accurate measurements can significantly impact patient care.

The other choices reflect common measurements but do not accurately represent the equivalent of a teaspoon. Knowing that there are 5 mL in one teaspoon helps in ensuring proper dosing and measurement in both culinary and medical contexts.