Task: Question Answering
Input (English): passage: Today the Tower's ravens are one of the attractions for tourists visiting the City of London. Vladimir Putin, the President of Russia, is reported to have been impressed by the birds' verbal skills; one of the ravens greeted each person in his entourage with a ``Good morning!''. However, visitors are advised not to feed the birds, and warned that a raven will bite if it feels threatened.
 question: are there still ravens in the tower of london?
Output (English): Yes