This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gas Transport, Subject name: Physiology
In plasma, carbon-di-oxide is mainly transported as: (Repeat) 
Select and explain. 
A. Dissolved CO2, B. HCO3-, C. Carboxy haemoglobin, D. Carbamino haemoglobin
B: HCO3-
Answer: B: HCO3- 
Explanation: Ans: B (HCO3-) Ref: Pal GK. Transport of gases in blood. In: Textbook of medical physiology. Ahuja publishing house. 2007: 91: 733.Explanation:Carbon Dioxide Transport in Blood1. HCO3- in plasma and in RBCs - 70%2. Formation of carbamino compounds with plasma protein (23%)3. Dissolved form (7%)