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

Ex Input:
Waves contain?, Context: As an electro-magnetic wave travels through the different parts of the antenna system (radio, feed line, antenna, free space) it may encounter differences in impedance (E/H, V/I, etc.). At each interface, depending on the impedance match, some fraction of the wave's energy will reflect back to the source, forming a standing wave in the feed line. The ratio of maximum power to minimum power in the wave can be measured and is called the standing wave ratio (SWR). A SWR of 1:1 is ideal. A SWR of 1.5:1 is considered to be marginally acceptable in low power applications where power loss is more critical, although an SWR as high as 6:1 may still be usable with the right equipment. Minimizing impedance differences at each interface (impedance matching) will reduce SWR and maximize power transfer through each part of the antenna system.

Ex Output:
power


Ex Input:
Why did the NTC take over?, Context: Following his defeat in the civil war, Gaddafi's system of governance was dismantled and replaced under the interim government of the NTC, who legalised trade unions and freedom of the press. In July 2012, elections were held to form a new General National Congress (GNC), who officially took over governance from the NTC in August. The GNC proceeded to elect Mohammed Magariaf as president of the chamber, and then voted Mustafa A.G. Abushagur as Prime Minister; when Abushagar failed to gain congressional approval, the GNC instead elected Ali Zeidan to the position. In January 2013, the GNC officially renamed the Jamahiriyah as the "State of Libya".

Ex Output:
Following his defeat in the civil war, Gaddafi's system of governance was dismantled


Ex Input:
What was the main factor in the lack of raw material?, Context: For Germany, because an autarkic economic approach or an alliance with Britain were impossible, closer relations with the Soviet Union to obtain raw materials became necessary, if not just for economic reasons alone. Moreover, an expected British blockade in the event of war would create massive shortages for Germany in a number of key raw materials. After the Munich agreement, the resulting increase in German military supply needs and Soviet demands for military machinery, talks between the two countries occurred from late 1938 to March 1939. The third Soviet Five Year Plan required new infusions of technology and industrial equipment.[clarification needed] German war planners had estimated serious shortfalls of raw materials if Germany entered a war without Soviet supply.

Ex Output:

economic approach or an alliance with Britain were impossible