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
[{'content': 'CO2 is mainly transported in the blood in which form: \nSelect and explain. \nA. Dissolved form, B. HCO3, C. Carbamino compound, D. Gas form', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CO2 is transported in the blood in 3 forms:\n\nAs HCO3- CO2\xa0is mainly transported in bicarbonate form - 70%. When CO2\xa0diffuses into RBC, it reacts chemically with water and with help of enzyme carbonic anhydrase it is converted into HCO3\xa0+ H + CO2+ H2O → HCO3+H +\u200b\nAs dissolved CO2: 6 - 7% of CO2\xa0transport\u200b\nAs carbamino compound of Hb and other plasma proteins: 20% of C02\xa0transport.', 'role': 'assistant'}]