This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following is used by RBCs in the fasting state? 
Select and explain. 
A. Glucose, B. Alanine, C. Ketone body, D. Fatty acid
A: Glucose
Answer: A: Glucose 
Explanation: Ans: A. GlucoseGlucose is used by RBCs in fasting state.OrganFedFastingStarvationBrainGlucoseGlucoseKetone bodiesHeaFatty Fatty acidsKetone bodiesLiverGlucoseFatty acidsAmino acidsMusclesGlucoseFatty acidsFatty acids & ketoneAdipose tissueGlucoseFatty acidsFatty acids & ketone RBCsGlucoseGlucose (Ref Harper 30/e p146, 150, 28/e p141).