This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Chain, Subject name: Biochemistry
Respiratory quotient after heavy carbohydrate meal is: 
Select and explain. 
A. 1, B. 1.2, C. 0.8, D. 0.7
A: 1
Answer: A: 1 
Explanation: Ans. A. 1* Respiratory quotient is defined as CO2 eliminated/O2 consumed.* For glucose, with the molecular formula, C6 H12 O6 , the complete oxidation equation is C6 H12 O6 +6O2 -6CO2 +6H2 O.* Thus, the RQ=6CO2 /6O2 =1.* Insulin, which increases lipid storage and decreases fat oxidation, is positively associated with increases in the respiratory quotient. A positive energy balance will also lead to an increased respiratory quotient.Name of the food stuffRespiratory quotientCarbohydrates1Proteins0.8-0.9Fat0.7Oxalic acid4.0Mixed diet0.8Malic acid1.33