This is a little tricky, and even native speakers may not agree. " My son is a doctor. Oh really?
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Grammar GeekThis is a little tricky, and even native speakers may not agree.Yeah I would say so, but I needed some funda
I would be more likely to use "at."
My son is a doctor.
Oh really? Great. Where is his practice?
Oh, he works full-time at the hospital on the surgical staff.
But this may be individual, or regional.