Before allowing a certain type of medicine to be given out, there are certain restrictions that have to be met. For this one, you have to have pneumonia to receive this medicine.
Mother sees a prescription with the medicine on it but without a note for pneumonia, so she calls the prescribing doctor.
"Does the patient have pneumonia?" so that she can give him the proper medicine.
"Yes."
"Oh, okay. That's good."
The doctor hesitates. "...No, that's not a good thing."