Input: Article: In the United States, their persistent legal challenges prompted a series of state and federal court rulings that reinforced judicial protections for civil liberties. Among the rights strengthened by Witness court victories in the United States are the protection of religious conduct from federal and state interference, the right to abstain from patriotic rituals and military service, the right of patients to refuse medical treatment, and the right to engage in public discourse. Similar cases in their favor have been heard in Canada.

Now answer this question: What right to abstain from do Jehovah's Witnesses exercise?

Output: patriotic rituals and military service

Input: Article: The U.S. dollar is fiat money. It is the currency most used in international transactions and is the world's most dominant reserve currency. Several countries use it as their official currency, and in many others it is the de facto currency. Besides the United States, it is also used as the sole currency in two British Overseas Territories in the Caribbean: the British Virgin Islands and the Turks and Caicos islands. A few countries use only the U.S. Dollar for paper money, while the country mints its own coins, or also accepts U.S. coins that can be used as payment in U.S. dollars, such as the Susan B. Anthony dollar.

Now answer this question: Although for some countries the dollar is not their official currency, how do they use the currency?

Output: de facto currency

Input: Article: 
 Great Britain: The torch relay leg held in London, the host city of the 2012 Summer Olympics, on April 6 began at Wembley Stadium, passed through the City of London, and eventually ended at O2 Arena in the eastern part of the city. The 48 km (30 mi) leg took a total of seven and a half hours to complete, and attracted protests by pro-Tibetan independence and pro-Human Rights supporters, prompting changes to the planned route and an unscheduled move onto a bus, which was then briefly halted by protestors. Home Secretary Jacqui Smith has officially complained to Beijing Organising Committee about the conduct of the tracksuit-clad Chinese security guards. The Chinese officials, seen manhandling protesters, were described by both the London Mayor Ken Livingstone and Lord Coe, chairman of the London Olympic Committee as "thugs". A Metropolitan police briefing paper revealed that security for the torch relay cost £750,000 and the participation of the Chinese security team had been agreed in advance, despite the Mayor stating, "We did not know beforehand these thugs were from the security services. Had I known so, we would have said no."

Now answer this question: Where did the relay end in London?

Output:
O2 Arena