Final answer:
The nurse is administering the drug furosemide, also known as Lasix. The brand name of a drug is the name given to it by the pharmaceutical company that manufactures it.
Step-by-step explanation:
The nurse is administering the drug furosemide, also known by its brand name Lasix. Therefore, the correct answer is D. brand name. Brand names are the names given to a particular drug by the pharmaceutical company that manufactures it.