The endogenous compounds are produced inside the body. The exogenous products are released outside the body.
Renal products are produced by the kidney whereas hereditary aspects describe inheritance and genetic components to the next generation.
Thus, the options (b), (d) and (c) are incorrect.
The endogenous compounds are produced inside the body. The exogenous products are released outside the body.
Therefore, the correct option is – a. produced outside the body.