The renal terms are pertaining to kidney. Therefore, in the above case, nurses are explaining to take care of his kidneys from renal diseases. She is giving instructions to that.
The other words such as fetal (embryonic period), heart (cardiac) and lung (pulmonary) are not going to depict the meaning of renal components.
Thus, the options (a), (d) and (c) are incorrect.
The renal terms are pertaining to kidney. Therefore, in the above case, nurses are explaining to take care of his kidneys from renal diseases. She is giving instructions to that.
Therefore, the correct option is – b. Kidney