A Patient with a Respiratory Bacterial Infection Asks Why a Sputum

A patient with a respiratory bacterial infection asks why a sputum sample is being collected before starting antibacterial drug therapy.What is the nurse's best response?

A) "Drug therapy for lung infections works better when less sputum is present."
B) "A sputum sample will help us determine what drug will work best against your infection."
C) "The lab will be able to determine which drug will treat your infection without harming your normal tissues."
D) "The dosage of your antibacterial drug is determined by the organism that is causing your infection."