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.

[EX Q]: Passage: Reptiles such as adders and vipers live up to the snow line; because they cannot bear the cold temperatures they hibernate underground and soak up the warmth on rocky ledges. The high-altitude Alpine salamanders have adapted to living above the snow line by giving birth to fully developed young rather than laying eggs. Brown trout can be found in the streams up to the snow line. Molluscs such as the wood snail live up the snow line. Popularly gathered as food, the snails are now protected. Question: Why do reptiles only live up to the snow line?
[EX A]: they cannot bear the cold temperatures

[EX Q]: Passage: Aonuma had anticipated creating a Zelda game for what would later be called the Wii, but had assumed that he would need to complete Twilight Princess first. His team began work developing a pointing-based interface for the bow and arrow, and Aonuma found that aiming directly at the screen gave the game a new feel, just like the DS control scheme for Phantom Hourglass. Aonuma felt confident this was the only way to proceed, but worried about consumers who had been anticipating a GameCube release. Developing two versions would mean delaying the previously announced 2005 release, still disappointing the consumer. Satoru Iwata felt that having both versions would satisfy users in the end, even though they would have to wait for the finished product. Aonuma then started working on both versions in parallel.[o] Question: Which Nintendo employee was confident in the potential of developing two versions of Twilight Princess?
[EX A]: Satoru Iwata

[EX Q]: Passage: Relations between the Rus' and Byzantines became more complex after Oleg took control over Kiev, reflecting commercial, cultural, and military concerns. The wealth and income of the Rus' depended heavily upon trade with Byzantium. Constantine Porphyrogenitus described the annual course of the princes of Kiev, collecting tribute from client tribes, assembling the product into a flotilla of hundreds of boats, conducting them down the Dnieper to the Black Sea, and sailing to the estuary of the Dniester, the Danube delta, and on to Constantinople. On their return trip they would carry silk fabrics, spices, wine, and fruit. The importance of this trade relationship led to military action when disputes arose. The Primary Chronicle reports that the Rus' attacked Constantinople again in 907, probably to secure trade access. The Chronicle glorifies the military prowess and shrewdness of Oleg, an account imbued with legendary detail. Byzantine sources do not mention the attack, but a pair of treaties in 907 and 911 set forth a trade agreement with the Rus', the terms suggesting pressure on the Byzantines, who granted the Rus' quarters and supplies for their merchants and tax-free trading privileges in Constantinople. Question: What were the primary concerns the Rus and Byzantines had with oleg?
[EX A]:
commercial, cultural, and military concerns