Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Example Input: Context: Carpal tunnel syndrome (CTS) is the most common median nerve neuropathy, accounting for 90% of all neuropathies. Carpal tunnel syndrome presents in 3.8% of the general population, with a higher prevalence among women. There are several risk factors associated with CTS, including both medical and non medical factors. The pathophysiologic mechanisms involved in the median nerve compression and traction are thought to be complex, and as yet are not fully understood. The present review aimed to provide an overview of the pathophysiology of median nerve neuropathy in the carpal tunnel, and subsequent development of CTS. 
 Question: What nerve is involved in carpal tunnel syndrome?
Example Output: median

Example Input: Context: Young people frequently say that they want to exercise, but they just can't find the time. The solution just might be in-office interval training. Recent studies show that very short but intense exercise rapidly builds and maintains fitness and health, even when the workout is only a few minutes long. Work the stairs You can complete an excellent, effective -- and very brief -- workout in an office stairwell, says Martin Gibala, a professor of kinesiology at McMaster University in Canada and an expert on interval training. For a study that he and his colleagues presented earlier this year, they asked 12 out-of-shape women in their 20s to warm up for two minutes by slowly walking up and down stairs in a campus office building. They completed three of these abbreviated stair workouts per week for six weeks. By the end, their aerobic fitness had improved substantially, the researchers reported, by about as much as if they had been running or cycling each week for hours. Fidget your way to fitness. Parents and teachers may once have urged you to sit still, but wiggling, tapping your toes, standing briefly, and otherwise fidgeting as much as possible at your desk is in fact good for your body. In one recent study, college students showed healthier blood flow in their lower legs if they fidgeted than if they did not. Even better, a 2008 study found that among office workers, those who frequently fidgeted burned as many as 300 calories more each day than those who resolutely stayed still. 
 Question: How many studies are shown in the passage?
Example Output: three

Example Input: Context: [[Hrothgar]], king of Danelands, and a group of mounted and helmeted warriors chase a large and burly man, whom they consider a monstrous [[troll]], and his young son across a large open field until father and son find themselves on the edge of deep cliff overlooking a beach and a large sea. The father directs his young son, [[Grendel]], to climb down and hide from the attackers' view. The Danes shoot the father dead with their arrows and his dead body plunges down onto the beach far below. The Danish king walks towards the cliff edge and sees the young Grendel hanging but chooses to spare him.Later, Grendel is on the beach below and finds his father's body. After failing to move the large and heavy corpse, the boy takes a sword and cuts the head off to take it home.Many years later, the severed (and mummified) head is inside a cave where the boy Grendel has grown up to be as large and burly as his father. Grendel bloodies his own forehead with stones to express his vengeful anger towards the Danes and the beginning of his own murderous campaign of revenge.When Hrothgar finds twenty of his warriors killed inside his great hall, the Danish king falls into a depression. [[Beowulf (hero)|Beowulf]], with the permission of [[Hygelac]], king of [[Gotaland|Geatland]], sails to Daneland with thirteen Geats on a mission to slay Grendel for Hrothgar.The arrival of Beowulf and his warriors is welcomed by Hrothgar, but the king's village has fallen into a deep despair and many of the pagan villagers convert to Christianity at the urging of an [[Irish monk]]. While Grendel does go into Hrothgar's village during the night, he flees rather than fight.Beowulf learns more about Grendel from Selma the witch and seer, who tells Beowulf that Grendel will not fight him because Beowulf has committed no wrong against him. A villager, recently baptized and thus now unafraid of death, leads Beowulf and his men to the cliff above Grendel's cave, but without a rope they are afraid to die descending to the cave itself, and turn back without even seeing the cave. When that villager is found broken and dead, Beowulf and his men return with a rope and gain entry to Grendel's secret cave. Grendel being absent, one of Beowulf's vengeful men mutilates the mummified head and shrine of Grendel's slain father.That night, Grendel attacks Beowulf and his men while they sleep in Hrothgar's great hall, killing the Geat who desecrated his father's head and then, revenge satisfied, leaps out from the second story, but is caught in a trap by Beowulf, leaving Grendel hanging by his right arm. Grendel, refusing capture, escapes by hacking off his own arm. Grendel, bleeding severely, manages to reach the same beach where he had once found his father's slain corpse and wades into the water, where he dies, his body claimed by a mysterious webbed hand. Hrothgar admits to Beowulf that he had killed Grendel's father for stealing a fish but had spared the child-troll Grendel out of pity.There is great celebration in the hall of Hrothgar, and the king's mood has been livened up by the defeat of Grendel, whose severed arm is kept by the Danes as a trophy.In revealing more about Grendel's nature, Selma recounts how Grendel had once visited her hut and clumsily raped her and has protected her since that day, troubling Beowulf all the more. Yet that does not stop him from moving forward to kiss Selma, who deftly slaps him for tying her up earlier in the film, which he did in an attempt to get her to lead him to Grendel. Nevertheless, she then pulls his head forward and kisses him, quickly initiating and taking the lead in their lovemaking as she straddles him down on her bed.The Danes are later attacked by [[Grendel's mother]], the Sea Hag. Beowulf finds her lair, where she placed Grendel's dead body along with a pile of treasure, and slays Grendel's mother with 
 Question: How many of his warriors does Hrothgar find killed?
Example Output:
twenty