Was Harry Potter chosen by Dumbledore, to fulfill the prophecy? If not, who was he chosen by?
The Harry Potter series is about a boy, Harry Potter, who finds out on his eleventh birthday that his late mother and father were wizards who were murdered by an evil wizard, Voldemort. Voldemort disappeared the night of the murder after turning his killing curse towards Harry; the curse rebounded off of Harry and hit Voldemort, making Harry the first person to ever survive the killing curse. Voldemort returns with the desire to obtain a prophecy about Harry and himself, because he thinks if he hears the entire prophecy he will have the knowledge he needs to finally kill Harry.
Towards the end of the fifth book in the series, Harry Potter and the Order of the Phoenix, Voldemort uses his connection to Harry's mind to plant a false image of Harry's godfather Sirius Black being tortured with the Cruciatus curse in the Ministry of Magic, in order to lure Harry to the Department of Mysteries, where prophecies are held. It is later revealed that prophesies can only be retrieved by those whom they are about, and that Voldemort was after a prophecy concerning Harry and himself. Harry destroys the prophecy and Voldemort leaves the Ministry of Magic empty-handed, but Professor Dumbledore has a copy of the prophecy because he was the person to whom it was told.
The prophecy states "The one with power to vanquish the Dark Lord approaches... Born to those who have thrice defied him, born as the seventh month dies...the Dark Lord will mark him as his equal". In the end it turns out that the prophesy did not specifically state anyone and Voldemort was the one who chose Harry as the child the prophesy specified.