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
What is the respiratory quotient for a carbohydrate meal 
Select and explain. 
A. 0.7, B. 0.8, C. 0.6, D. 1
D: 1
Answer: D: 1 
Explanation: Carbohydrate RQ = 1
Fat RQ = 0.7
Protein RQ = 0.8