Concept:Calorific value is the amount of energy released when a food substance is metabolised by the body.
Explanation:Proteins, carbohydrates, and lipids are energy-yielding nutrients, so each provides a measurable calorific value.
Carbohydrates and proteins supply about
4 kilocalories per gram, while lipids supply about
9 kilocalories per gram.
Water is not oxidised or metabolised to release energy for cellular activities.
Instead, water acts as a solvent, a transport medium, and a temperature regulator in the body.
Since it contributes no fuel for energy production, water has little or no calorific value.
Therefore, among the given options, water is the correct choice.
Answer:D. Water