"The man is a scientist."
Translation:Bărbatul este un om de știință.
I tried to answer with "bărbatul este savant," which was dinged in favor of "bărbatul este un savant." In general, I understand that in this sort of construction, the indefinite article is optional and usually omitted.
Are there some kinds of professions (like 'savant,' possibly) where the indefinite article is mandatory? Or is this just a beta oversight?