Which of the following carbohydrates is the primary source of energy for the brain and red blood cells?

A Galactose
B Fructose
C Glucose ✓
D Lactose

Explanation

Glucose is the primary source of energy for the brain and red blood cells, as they lack the enzymes necessary to metabolize other carbohydrates.

Mnemonic

'Glucose' = 'glue' for brain and RBCs, 'source' of energy

Source

Guyton and Hall Textbook of Medical Physiology
Carbohydrate Metabolism Biochemistry Carbohydrate Utilization Easy MEDICAL Confidence: high