What fraction of the carbon dioxide exhaled by animals is generated by the reactions of the citric acid cycle, if glucose is the sole energy source?

What fraction of the carbon dioxide exhaled by animals is generated by the reactions of the citric acid cycle, if glucose is the sole energy source? 






A) 1/6
B) 1/3
C) 1/2
D) 2/3
E) 100/100








Answer: D


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