The endogenous components are produced inside the body whereas exogenous components are generated outside the body.
Polluting compounds are produced from antropogenic causes. Hemocratic values represent total RBC volume out of total volume of blood.
Thus, the options (b), (d) and (c) are incorrect.
The endogenous components are produced inside the body whereas exogenous components are generated outside the body.
Therefore, the correct option is – a. produced within the body