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: Tito's notable grandchildren include Aleksandra Broz, a prominent theatre director in Croatia; Svetlana Broz, a cardiologist and writer in Bosnia-Herzegovina; and Josip "Joška" Broz, Edvard Broz and Natali Klasevski, an artisan of Bosnia-Herzegovina. Question: Which of Tito's grandchildren is a cardiologist and writer?
Example Output: Svetlana Broz

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: Most historians today, including John's recent biographers Ralph Turner and Lewis Warren, argue that John was an unsuccessful monarch, but note that his failings were exaggerated by 12th- and 13th-century chroniclers. Jim Bradbury notes the current consensus that John was a "hard-working administrator, an able man, an able general", albeit, as Turner suggests, with "distasteful, even dangerous personality traits", including pettiness, spitefulness and cruelty. John Gillingham, author of a major biography of Richard I, follows this line too, although he considers John a less effective general than do Turner or Warren, and describes him "one of the worst kings ever to rule England". Bradbury takes a moderate line, but suggests that in recent years modern historians have been overly lenient towards John's numerous faults. Popular historian Frank McLynn maintains a counter-revisionist perspective on John, arguing that the king's modern reputation amongst historians is "bizarre", and that as a monarch John "fails almost all those [tests] that can be legitimately set". Question: What biographers argue that John was an unsuccessful monarch?
Example Output:
Ralph Turner and Lewis Warren