challenge: In the period 2000-2011, how did public expenditure on health in Poland change?
  
  A. Decreased from 4.3% to 3.9% of the GDP
  B. Increased from 3.9% to 4.3% of the GDP
  C. Remained stable at 5.0% of the GDP
  D. Increased from 3.9% to 5.0% of the GDP
  Answer: 