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.

Example Input: Passage: Season ten of the series premiered on January 19, 2011. Many changes were introduced this season, from the format to the personnel of the show. Jennifer Lopez and Steven Tyler joined Randy Jackson as judges following the departures of Simon Cowell (who left to launch the U.S. version of The X Factor), Kara DioGuardi (whose contract was not renewed) and Ellen DeGeneres, while Nigel Lythgoe returned as executive producer. Jimmy Iovine, chairman of the Interscope Geffen A&M label group, the new partner of American Idol, acted as the in-house mentor in place of weekly guest mentors, although in later episodes special guest mentors such as Beyoncé, will.i.am and Lady Gaga were brought in. Question: Who replace weekly mentors as a more permanent mentor on American Idols tenth season? 
Example Output: Jimmy Iovine

Example Input: Passage: The most common cause is an infection of the intestines due to either a virus, bacteria, or parasite; a condition known as gastroenteritis. These infections are often acquired from food or water that has been contaminated by stool, or directly from another person who is infected. It may be divided into three types: short duration watery diarrhea, short duration bloody diarrhea, and if it lasts for more than two weeks, persistent diarrhea. The short duration watery diarrhea may be due to an infection by cholera, although this is rare in the developed world. If blood is present it is also known as dysentery. A number of non-infectious causes may also result in diarrhea, including hyperthyroidism, lactose intolerance, inflammatory bowel disease, a number of medications, and irritable bowel syndrome. In most cases, stool cultures are not required to confirm the exact cause. Question: What can cause an infection in the intestines?
Example Output: a virus, bacteria, or parasite

Example Input: Passage: Minority leaders may engage in numerous activities to publicize their party's priorities and to criticize the opposition's. For instance, to keep their party colleagues "on message," they insure that partisan colleagues are sent packets of suggested press releases or "talking points" for constituent meetings in their districts; they help to organize "town meetings" in Members' districts around the country to publicize the party's agenda or a specific priority, such as health care or education; they sponsor party "retreats" to discuss issues and assess the party's public image; they create "theme teams" to craft party messages that might be raised during the one-minute, morning hour, or special order period in the House; they conduct surveys of party colleagues to discern their policy preferences; they establish websites that highlight and distribute party images and issues to users; and they organize task forces or issue teams to formulate party programs and to develop strategies for communicating these programs to the public. Question: How do minority leaders gauge party preferences?
Example Output:
conduct surveys of party colleagues