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: Physiology
Largest fraction of CO2 is present in blood as 
Select and explain. 
A. Attached with RBC, B. Dissolved in blood, C. Wth Hb as carbaminohemoglobin, D. Bicarbonate
D: Bicarbonate
Answer: D: Bicarbonate 
Explanation: None