The correct answer is: A. Dilute alcohol
Ethanol containing 5% water is known as dilute alcohol. It is a solution of ethanol in water, with a concentration of ethanol between 1% and 50%. Dilute alcohol is used in a variety of applications, including as a solvent, a fuel, and a beverage.
Option B, power alcohol, is a type of ethanol that is blended with gasoline to increase its octane rating. It is also known as gasohol or ethanol-gasoline blend.
Option C, rectified spirit, is a type of ethanol that has been purified to a high degree. It is typically used in laboratory and industrial applications.
Option D, absolute alcohol, is a type of ethanol that has been purified to the point where it contains no water. It is typically used in medical and pharmaceutical applications.