A severe bacterial infection is treated with ciprofloxacin, prescribed as 100 mg added to 50 mL IV PB q12h. On hand is ciprofloxacin 400 mg per 40 mL. How many milliliters contain the prescribed dosage?

A. 5 mL
B. 10 mL
C. 15 mL
D. 20 mL

Answer: B