Which measurement unit is expressed in degrees Celsius (Centigrade)?

The measurement unit expressed in degrees Celsius is commonly referred to as 'C.' Celsius is a scale used to measure temperature, where 0 degrees is the freezing point of water and 100 degrees is the boiling point at standard atmospheric pressure. This unit is widely used in scientific contexts and everyday situations to describe temperature in many regions around the world.

The other units mentioned serve entirely different purposes. Milliliters (ml) measure volume, often used for liquids. Feet (ft) are a unit for measuring length or distance, primarily used in the United States and a few other countries. Quarts (qt) are another volume measurement, primarily used for liquids as well, but larger than milliliters. Thus, only 'C' connects directly to temperature measurement in the Celsius scale.