instruction:
In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
question:
In the United States, the pardon power for federal crimes is granted to the President of the United States under Article II, Section 2 of the United States Constitution which states that the President 'shall have power to grant reprieves and pardons for offenses against the United States, except in cases of impeachment'. The U.S. Supreme Court has interpreted this language to include the power to grant pardons, conditional pardons, commutations of sentence, conditional commutations of sentence, remissions of fines and forfeitures, respites, and amnesties.
answer:
why does the president have power to pardon


question:
During the 19th century the symbol began to proliferate among the Jewish communities of Eastern Europe, ultimately being used among the Jewish communities in the Pale of Settlement. A significant motivating factor, according to scholar Gershom Sholem, was the desire to represent Jewish religion and / or identity in the same manner the Christian cross identified that religion's believers. The earliest Jewish usage of the symbol was inherited from medieval Arabic literature by Kabbalists for use in talismanic protective amulets (segulot) where it was known as a Seal of Solomon. The symbol was also used in Christian churches as a decorative motif many centuries before its first known use in a Jewish synagogue. Before the 19th century, official use in Jewish communities was generally known only in the region of today's Czech Republic, Austria and possibly parts of Southern Germany, having begun in medieval Prague.
answer:
what is the star of david used for


question:
A roller coaster is a type of amusement ride that employs a form of elevated railroad track designed with tight turns, steep slopes, and sometimes inversions. People ride along the track in open cars, and the rides are often found in amusement parks and theme parks around the world. LaMarcus Adna Thompson obtained one of the first known patents for a roller coaster design in 1885, related to the Switchback Railway that opened a year earlier at Coney Island. The track in a coaster design does not necessarily have to be a complete circuit, as shuttle roller coasters demonstrate. Most roller coasters have multiple cars in which passengers sit and are restrained. Two or more cars hooked together are called a train. Some roller coasters, notably wild mouse roller coasters, run with single cars.
answer:

when was the first ever roller coaster built