Question 1 of 5.   Chlorine is added to municipal water supplies to suppress bacterial growth. The chlorine may be present as free chlorine or as chloramines (so-called combined chlorine). Which of these statements about chlorine in the water supply is true?
a)			Free chlorine readily crosses dialyzer membranes, whereas chloramines are complex molecules that do not easily cross dialyzer membranes, particularly low-flux membranes.
b)			Chloramines are being replaced by free chlorine for disinfecting municipal water supplies
c)			Chloramines are strong oxidants that damage red blood cells, leading to anemia.
d)			Chloramine concentrations of 10 mg/L, or less, pose no risk to hemodialysis patients.