The special potion that forces people to spill all of their deepest secrets is called "Veritaserum".
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In the book she didn't. It was Marietta Edgecombe. In the movie however it was Cho. At one point Harry tells Cho that he heard Umbridge gave her a hard way to go. Later, when Harry is caught by Umbridge and the Inquisitorial Squad, Umbridge calls Snape into her office. She demands that he bring her more Veritaserum (a truth serum). Snape advises her that she used the last of the serum on Miss Chang.
Harry learned a few things, but the most important was that Harry would have to die in order to destroy Voldemort. He also learned that Snape has always loved his mother, and that he has been working as a double agent for seventeen years.
Sirius Black was James Potter's friend and Harry Potter's godfather.He was the only member of the Black family to be placed in a house that wasn't Gryffindor. His parents disowned him when he was sixteen and he went to live with James Potter.He was originally named Lily and James' secret keeper but persuaded them to change to Peter Pettigrew at the last moment as he believed himself to be the obvious choice, however they neglected to tell Albus Dumbledore which is why Sirius was imprisoned after Peter Pettigrew betrayed them. He was also believed to have killed thirteen muggles along with Peter but it was actually Peter who blew up the street and faked his own death.Sirius escaped from Azkaban in Harry Potter and the Prisoner of Azkaban and was the first person who ever managed to do so. Nobody knew how he managed it until Harry learned that he was an unregistered Animagus which allowed him to slip through the bars and swim to shore in the form of a dog.When he escaped it was believed that he was trying to kill Harry Potter but he was attempting to protect him from Peter who he had seen on Ron Weasley's shoulder in a picture. Sirius, aided by Remus Lupin, explains the truth to Harry and forces Peter out of hiding. However they are caught and Harry and Hermione are forced to go back in time to save him from the dementors kiss.When Lord Voldemort rose to power he offered his family house as Headquarters because it was heavily guarded. He became frustrated at never having his name cleared and not being allowed to leave the house. Lord Voldemort used Sirius to lure Harry to the ministry, Sirius along with others than came to help which resulted in his death.He was killed by his cousin, Bellatrix Lestrange, in the Department of Mysteries in 1995. His name was cleared after this. His death marked the end of the Black family as all other descendants were females.
He was called al Farooq that is the one who distinguishes between truth and false hood
Its 'The One With The Truth About London'