Urea is represented as
A
NH<sub>2</sub>.CO.NH<sub>2</sub>
B
NH<sub>3</sub>CO.CH<sub>3</sub>
C
NH.CO<sub>2</sub>.NH
D
NH<sub>3</sub>.CO<sub>2</sub>.NH<sub>3</sub>
Correct Answer: NH<sub>2</sub>.CO.NH<sub>2</sub>