This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Input: Consider Input: Passage: After years of negotiation, three Great Powers, Russia, the United Kingdom and France, decided to intervene in the conflict and each nation sent a navy to Greece. Following news that combined OttomanEgyptian fleets were going to attack the Greek island of Hydra, the allied fleet intercepted the OttomanEgyptian fleet at Navarino. After a week-long standoff, a battle began which resulted in the destruction of the OttomanEgyptian fleet. A French expeditionary force was dispatched to supervise the evacuation of the Egyptian army from the Peloponnese, while the Greeks proceeded to the captured part of Central Greece by 1828. As a result of years of negotiation, the nascent Greek state was finally recognized under the London Protocol in 1830. Question: What three countries sent their Navy to Greece?

Output: Russia, the United Kingdom and France

Input: Consider Input: Passage: Because of the acceptance of miscegenation, Brazil has avoided the binary polarization of society into black and white. In addition, it abolished slavery without a civil war. The bitter and sometimes violent racial tensions that have divided the US are notably absent in Brazil. According to the 2010 census, 6.7% of Brazilians said they were black, compared with 6.2% in 2000, and 43.1% said they were racially mixed, up from 38.5%. In 2010, Elio Ferreira de Araujo, Brazil's minister for racial equality, attributed the increases to growing pride among his country's black and indigenous communities. Question: How do the US and Brazil vary after slavery has ended?

Output: violent racial tensions that have divided the US are notably absent in Brazil.

Input: Consider Input: Passage: As the Nintendo Entertainment System grew in popularity and entered millions of American homes, some small video rental shops began buying their own copies of NES games, and renting them out to customers for around the same price as a video cassette rental for a few days. Nintendo received no profit from the practice beyond the initial cost of their game, and unlike movie rentals, a newly released game could hit store shelves and be available for rent on the same day. Nintendo took steps to stop game rentals, but didn't take any formal legal action until Blockbuster Video began to make game rentals a large-scale service. Nintendo claimed that allowing customers to rent games would significantly hurt sales and drive up the cost of games. Nintendo lost the lawsuit, but did win on a claim of copyright infringement. Blockbuster was banned from including original, copyrighted instruction booklets with their rented games. In compliance with the ruling, Blockbuster produced their own short instructionsusually in the form of a small booklet, card, or label stuck on the back of the rental boxthat explained the game's basic premise and controls. Video rental shops continued the practice of renting video games and still do today. Question: Who caused Nintendo to take formal action regarding rentals?
Output: Blockbuster Video