I got PhD admission offers from 2 Universities (say A and B) and yesterday decided to accept one of them (University A). Today I decided to let University B know that I would not be able to join them. After they acknowledged my refusal to join, they asked for the name of University A since they keep track of the same for statistical purposes.
Is there any harm in letting them know? Or is it better to keep it private?
Edit
I guess I was fretting over nothing. I sent B a brief reply saying that I was going to accept the offer from A (I've already signed documents with A so I'm reasonably confident they won't leave me in the lurch). B replied wishing me the best of luck at A.
Thanks for the comments! I wasn't sure this was a common thing to ask for universities.