Hi,
Patient: Doc, is this a placebo?
Doc: No, it's a pharmacologically active.
Patient: I thought it was an inert.
The first remark is OK, but the second and third use terms that most patients would not be familiar with.
Patient:Is this a placebo?
Doc: No, it's actual medicine.
Patient: I thought it wasn't.
Where I live, I'd say that patients don't commonly address their doctor as 'Doctor' or 'Doc'.
Best wishes, Clive