We usually use pronouns to refer back to people or things that we already mentioned.
Can we use pronouns before we mention the noun?
A: Are you going to the game?
B: No, it's sold out. There aren't any tickets left.
Pronouns – Can ‘It’ Refer to Something Not Mentioned Yet?
pronouns
Best Answer
As Rob K mentions in his answer: In your example A has already defined the context, so "it" is perfectly clear.
However, it is not uncommon to say a pronoun without context, but it is awkward since the listener would not know the reference. You would have to add some further explanation what you mean.
I don't think this is unique to English, since it's more about the general quirks of pronouns or any ambiguous part of speech.