Extract the answer to the question from the following context. Question: According to the rules, what does a player need to remember if they want to block another player from getting through? Context: There are many rules to contact in this type of football. First, the only player on the field who may be legally tackled is the player currently in possession of the football (the ball carrier). Second, a receiver, that is to say, an offensive player sent down the field to receive a pass, may not be interfered with (have his motion impeded, be blocked, etc.) unless he is within one yard of the line of scrimmage (instead of 5 yards (4.6 m) in American football). Any player may block another player's passage, so long as he does not hold or trip the player he intends to block. The kicker may not be contacted after the kick but before his kicking leg returns to the ground (this rule is not enforced upon a player who has blocked a kick), and the quarterback, having already thrown the ball, may not be hit or tackled.
Ans: not hold or trip the player he intends to block

Extract the answer to the question from the following context. Question: what are the first mountains mentioned? Context: Ptolemy's Geography divided Asia on a similar basis. In the north is "Scythia this side of the Himalayas" and "Scythia beyond the Himalayas." To the south is "India on this side of the Ganges" and "India beyond the Ganges." Asia began on the coast of Anatolia ("land of the rising sun"). Beyond the Ganges and Himalayas (including the Tien Shan) were Serica and Serae (sections of China) and some other identifiable far eastern locations known to the voyagers and geographers but not to the general European public.
Ans: Himalayas

Extract the answer to the question from the following context. Question: What profession was held by the arbiter from Northern Europe who settled the matter of the area under Danish law in the nation now ruled by Elizabeth II? Context: The Vikings established Danelaw over much of the eastern and northern part of England with its boundary roughly stretching from London to Chester. It was an area of political and geographical control imposed by the Viking incursions which was formally agreed to by the Danish warlord, Guthrum and west-Saxon king, Alfred the Great in 886 AD. The Anglo-Saxon Chronicle recorded that London was "refounded" by Alfred the Great in 886. Archaeological research shows that this involved abandonment of Lundenwic and a revival of life and trade within the old Roman walls. London then grew slowly until about 950, after which activity increased dramatically.
Ans: Danish warlord

Extract the answer to the question from the following context. Question: How do CDs get ruined? Context: CDs are susceptible to damage during handling and from environmental exposure. Pits are much closer to the label side of a disc, enabling defects and contaminants on the clear side to be out of focus during playback. Consequently, CDs are more likely to suffer damage on the label side of the disc. Scratches on the clear side can be repaired by refilling them with similar refractive plastic or by careful polishing. The edges of CDs are sometimes incompletely sealed, allowing gases and liquids to corrode the metal reflective layer and to interfere with the focus of the laser on the pits. The fungus Geotrichum candidum, found in Belize, has been found to consume the polycarbonate plastic and aluminium found in CDs.
Ans: during handling and from environmental exposure