In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

[EX Q]: Who practices SODIS?, Context: Solar water disinfection (SODIS) involves exposing water-filled plastic polyethylene terephthalate (PET) bottles to sunlight for several hours. Exposure times vary depending on weather and climate from a minimum of six hours to two days during fully overcast conditions. It is recommended by the World Health Organization as a viable method for household water treatment and safe storage. Over two million people in developing countries use this method for their daily drinking water.
[EX A]: Over two million people

[EX Q]: The red in the nazi flag was symbolic of what, Context: Red, white, and black were the colors of the German Empire from 1870 to 1918, and as such they came to be associated with German nationalism. In the 1920s they were adopted as the colors of the Nazi flag. In Mein Kampf, Hitler explained that they were "revered colors expressive of our homage to the glorious past." The red part of the flag was also chosen to attract attention - Hitler wrote: "the new flag ... should prove effective as a large poster" because "in hundreds of thousands of cases a really striking emblem may be the first cause of awakening interest in a movement." The red also symbolized the social program of the Nazis, aimed at German workers. Several designs by a number of different authors were considered, but the one adopted in the end was Hitler's personal design.
[EX A]: the social program of the Nazis, aimed at German workers

[EX Q]: What was transformed into a lake by a demon?, Context: The ancient history of Kathmandu is described in its traditional myths and legends. According to Swayambhu Purana, present-day Kathmandu was once a huge and deep lake names "Nagdaha" as it was full of snakes. The lake was cut drained by Bodhisatwa Manjusri with his sword and the water was evacuated out from there and he established a city called Manjupattan and made Dharmakar the ruler of the valley land. After sometimes, a demon named Banasur closed the outlet and the valley was again a lake. Then lots Krishna came to Nepal, killed Banasur and again drained out water. He has brought some Gops with him and made Bhuktaman the king of Nepal.
[EX A]:
the valley