This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidneys and Body Fluids, Subject name: Physiology
[{'content': 'In a patient with a plasma pH of 7.1 the HCO3 / H2CO3 ratio in plasma is: \nSelect and explain. \nA. 20, B. 10, C. 2, D. 1', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans: b (10) Ref: Ganong, 22nd ed, p. 732This is a direct question from Ganong self study MCQs Chapter 39 Q.9This is based on the Henderson-Hasselbach equationpH = pK + log(HCO3)(H2CO3)pK - Ionisation constantIn body fluid it is more appropriate to use the apparent ionization constant ' k' = 6.10 (study by heart)So, pH= 6.10 +log(HCO3-)(H2CO3)pH = 7.1 given7.1 =6.10 +log(HCO3-)(H2C03) log (HCO3-)(H2CO3)= 1log 10 = 1 (HCO3-)(H2CO3)= 10", 'role': 'assistant'}]