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: Hoping to rebound from a divisional home loss to the Eagles, the Cowboys flew to Bank of America Stadium for a Week 16 Saturday night duel with the Carolina Panthers. In the first quarter, Dallas shot first with QB Tony Romo completing a 10-yard TD pass to WR Terrell Owens for the only score of the period. In the second quarter, the 'Boys continued their assault as RB Marion Barber got a 5-yard TD run. The Panthers would get on the board with QB Matt Moore completing an 11-yard TD pass to WR Steve Smith. The Cowboys end the half with rookie kicker Nick Folk getting a 42-yard field goal. In the third quarter, Carolina started to try a comeback as kicker John Kasay getting a 37-yard field goal for the only score of the period. In the fourth quarter, Dallas would respond with Folk kicking a 23-yard field goal. The Panthers tried to rally as Kasay nailing a 25-yard field goal, yet the 'Boys were able to hold off every possible attempt. With the win, the Cowboys improved to 13-2 and clinched homefield through NFC Playoffs with Green Bay's loss to Chicago on Sunday. Terrell Owens (5 receptions for 48 yards and 1 touchdown) left the game in the second quarter with a high left ankle sprain. 
 Question: What was the shortest field goal made?
Example Output: 23-yard

Example Input: Context: It is unanimously accepted that there is an unmet need for pain medications that are both effective and safe. Unfortunately, no really novel analgesics have been approved over the past three decades. In view of both experimental and clinical evidence of a major role for nerve growth factor (NGF) in the generation and maintenance of a wide range of pain states, drug discovery efforts focusing on the development of anti-NGF agents have aroused particular interest. Several humanized anti-NGF monoclonal antibodies (mAbs) have entered clinical trials as potential analgesics. In this respect, tanezumab is at an advanced stage of clinical development while fulranumab, fasinumab and ABT-110, previously known as PG110, are in early phases of clinical development. This Current Opinion article aims at describing the rationale for targeting NGF for pain, reviewing the analgesic efficacy and safety of anti-NGF agents based on data from fully published studies, conference abstracts, and the US Food and Drug Administration (FDA) website, and discussing the possible future of these agents in managing chronic pain. Anti-NGF mAbs produced significant pain relief and functional improvement in patients with osteoarthritis of the knee and/or hip. Conversely, studies in non-specific lower back pain generated mixed results; overall, this condition appeared to be less responsive to anti-NGF agents than osteoarthritis. Finally, there was no conclusive evidence of the effectiveness of anti-NGF mAbs in some types of chronic visceral or neuropathic pain. Furthermore, these studies raised safety concerns about anti-NGF mAbs. As a class, these drugs may cause or worsen peripheral neuropathies. But the most problematic issue-which prompted the FDA to place studies of these compounds on clinical hold in 2010-was rapid joint destruction leading to joint replacement surgery. The aetiologies of these side effects have been much debated and their pathophysiology is poorly understood. After an Arthritis Advisory Committee meeting held in March 2012, pharmaceutical companies negotiated with the FDA on the conditions for restarting clinical studies. Although the FDA lifted its clinical hold, there remain many unresolved issues about the long-term efficacy and safety of anti-NGF mAbs. While acknowledging that the future of these drugs is unforeseeable, it appears that they may not be the safe and effective painkillers that have been awaited for decades. 
 Question: What is the target of tanezumab?
Example Output: ngf

Example Input: Context: In 2025, a corporation called The Union has perfected the creation of artificial organs, which have replaced organ transplants. A potential customer can apply for an organ, which is sold on credit, at high interest. If a customer is unable to maintain payments, after three months, a repo-man is sent after the customer to 'reclaim' Union property. The process of the repossession is bloody & brutal, and often results in the death of the customer.Remy is one of the Union's top repo-men, who partners with his childhood friend, Jake, to collect on past due accounts. Remy is highly regarded within The Union as their top performer, though his occupation causes problems with his wife, who sees it as unsavory. After she leaves Remy when Jake commits a repossession in front of their home, Remy decides to transfer to a sales job, much to Jake's chagrin.As his final repossession job, Remy is sent to the residence of a music producer, whose work he happens to admire. After allowing the man enough time to complete a song, Remy prepares to repossess his heart. When he attempts to use a heart defibrillator to stop the unit, the defibrillator malfunctions, sending a large electrical shock through his body and knocking him into a coma. When Remy awakens from his coma, he is informed by Jake and Frank, his co-workers, that the shock severely damaged his heart. He can be fitted with an artificial heart, or die. After Remy attempts to flee the hospital, he reluctantly agrees to the procedure.Remy goes back to work, but is unable to perform his job, because he is just like the people he is repossessing from. He attempts to transition into sales, but quickly finds himself behind in payments. Jake takes Remy to the outskirts of the city to a nest, which is a collection of people who have past due accounts with the Union, but are fleeing to avoid being repossessed. Remy is again unable to perform a repossession, after which he is abandoned by Jake until he can perform his job. Remy is attacked by a pair of men from whom he was expected to repossess artiforgs, and knocked out.Remy, upon awakening, encounters Beth, whom he had met earlier in a bar where she was singing. He discovers that she has multiple body parts on which she is past due, and is currently suffering from a drug addiction. Remy takes her to a motel room, where he stays with her as she goes through withdrawal. After Jake interrupts his attempt to falsify artiforg returns on both of them back at the Union's headquarters, Remy leaves unassailed by Jake, returns to Beth, & the two leave to live in the outskirts.The pair live, for a time, in relative harmony. Remy uses an old typewriter that Beth has found to type up a narrative of his life, and subsequent conversion. As he finishes, a repo-man arrives to repossess his heart, but as he approaches Remy, he falls through a hole Remy has covered in the damaged floor, crashing to the floor below, unconscious. Then Beth, who was hiding behind the door, also falls when the floor collapses under her, re-injuring her leg. From above, Remy sees the Repo man coming to, readying to tranquilize or taze Beth. Remy drops the heavy typewriter onto him through the floor, crushing his head, to save himself and Beth. Using the repo-man's vehicle, Remy sneaks back into his former workplace to obtain a pair of devices that fool organ scanners used by repo-men. He attempts to force Frank to clear his account, only to discover that due to his previous aborted attempt, all accounts can now only be cleared back at the Union's central office.Remy and Beth attempt to flee the country at the airport, but are taken by security when it is discovered that Beth's prosthetic knee was damaged in their earlier encounter with the repo-man. Once inside, they are forced to fight against airport security and another pair of repo-men. They are able to kill or incapacitate 
 Question: When Beth fell through a hole in the floor, what prosthesis did she damage?
Example Output:
knee