In which form does the frog excrete out the nitrogenous waste?

In which form does the frog excrete out the nitrogenous waste?
A. Ammonia
B. Nitrogen
C. Urea
D. Uric acid

Answer:
C. Urea

Explanation:
The frog excretes nitrogenous wastes in the form of urea and thus is a ureotelic organism. Excretory wastes are carried by blood into the kidney where it is separated and excreted.