Which of the nitrogenous waste eliminated through saliva is ?

Which is not a nitrogenous waste

Assertion :- The primary function of sweat is to facilitate a cooling effect on the body surface. Reason :- Small amount of nitrogenous wastes could be eliminated through saliva.

 Assertion: Sebum provides a protective oily covering for the skin. Reason: Small amounts of nitrogenous wastes would be eliminated through saliva too.

What are nitrogenous wastes ?

This is not a nitrogenous waste

This is not a nitrogenous waste

This is not a nitrogenous waste

This is not a nitrogenous waste:

Common nitrogenous wastes are