Final answer:
Without additional context, it's not definitive which medication Mrs. Z should discontinue. Assuming a situation similar to Barbara's pneumonia, amoxicillin might be discontinued if Mrs. Z's condition is caused by Mycoplasma pneumoniae, which is unaffected by amoxicillin.
Step-by-step explanation:
The question asks which medication should likely be discontinued for Mrs. Z, given that she has no fever, shortness of breath, or rales. Without additional context from the provided clinical focus texts, it is not possible to give a definitive answer to this question. However, based on the scenario of Barbara with pneumonia that is unresponsive to amoxicillin but resolved with azithromycin, we can infer that if Mrs. Z's case is similar and she was prescribed amoxicillin, it may be suggested to discontinue amoxicillin (A) since azithromycin was effective in Barbara's case, indicating a possible Mycoplasma pneumoniae infection, which lacks a cell wall and does not respond to penicillin derivatives targeting peptidoglycan.