"This gentleman is an architect."
Translation:Ten pan jest architektem.
As the construction "Ten pan" is very specific, we don't accept "mężczyzna" here, even if it's hard to translate "ten pan" naturally into English. So at least in this course "ten pan" = "this gentleman".
EDIT several months later: Actually, we do accept 'mężczyzna' now.
Another correct answer is Ten dżentelmen jest architektem. Even PONS wordbook had this information.