The volume of oil in four different containers is shown below:
Container A: 5.25 milliliters
Container B: 5.29 milliliters
Container C: 5.27 milliliters
Container D: 5.23 milliliters
Sue has a measuring cup that can measure to the nearest tenth of a milliliter. If Sue measures the oil in each container, the least amount of oil would measure ____ milliliters.