In continuous bladder irrigation (CBI) if 400 mL of sterile saline solution is instilled into the bladder and 700 mL of urine and solution are drained out, how much true urine output is calculated?

A. This is incorrect B. This is incorrect C. This is incorrect D. True urine output is calculated by subtracting the amount of irrigating fluid instilled from the total output drained. 700 mL (total output) - 400 mL (instilled solution) = 300 mL true urine output.