Mrs. Bertrand is having a cholecystectomy this evening. To prevent dehydration she is to receive 5 percent dextrose in 0.45 percent saline solution at a rate of 150 ml/hour. Using 20 drops/ml tubing, what is the drip rate in drops/minute?

A) 150
B) 75
C) 60
D) 50

Answer: D) 50