I was told in writing here in this app (and in another Spanish app) that when saying what you are (what your profession is), you do not put an article before the name of your occupation.  Example:  “Mi papá es médico.” (My dad is a doctor.) - No un of una.  I took a test here earlier today and someone is a carpenter.  I left out the article and was correct.  Did I miss an exception?  I will say that in this test, it was the person saying what their own profession is. “Yo soy un ?”  I’ve already forgotten what the job was.  Can anyone let me know?  Gracias.