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
What is the daily requirement of potassium in a healthy adult? 
Select and explain. 
A. 2-3 g/day, B. 3-4 g/day, C. 4-5 g/day, D. 5-7 g/day
A: 2-3 g/day
Answer: A: 2-3 g/day 
Explanation: Minimum daily requirement for potassium in healthy adults is estimated to be 2g. The average intake of potassium among the adult population of industrialized world is approximately is 2-3 per day. Recommended daily intake of potassium to reduce risk of high blood pressure, stroke, and hea disease is 4-5g/d.