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.

Ex Input:
Context: Inventors are always looking for ways to make our lives easier, greener and a whole lot more fun. Take a look at the following breakthroughs in science and technology. What in the world will inventors dream up next? Superhero Suit Have you ever dreamed of becoming a superhero? Dream no more. There's a real Iron Man suit, XOS 2, which instantly transforms the person wearing it. The suit provides the power to lift 200 pounds with ease and break slabs of wood with a single karate chop. It was designed to help the military with heavy lifting. One person in the suit could do the work of three soldiers. Up, Up and Away! It took him 30 years to develop it, and now Glen Martin's invention is ready to take off. The Martin Jetpack allows its operator to fly 8,000 feet into the air. Unfortunately, you can't soar through the skies too long. The jetpack holds only 30 minutes' worth of fuel. The aircraft will sell for $100,000. Hardworking Robot The EMIEW2 robot is the perfect office helper. Need a document delivered? No problem! It can also guide visitors to their destinations. The three-foot-tall robot can identify different human voices and respond to commands. One day, it may serve as a receptionist or a security guard. Green Machine Say goodbye to gasoline! The AirPod car runs on air power. That means this car won't pollute the environment. A high-pressure air tank can fill the car in minutes. The three-wheeler can travel about 130 miles between fill-ups. Beef Power All aboard the beef train! Amtrak's Heartland Flyer runs partly on fuel that is made from cow fat. The goal is to reduce carbon emissions by 10%. The train travels between Oklahoma City, Oklahoma, and Fort Worth, Texas. Robo-Guard EMILY is a robotic, four-foot-long buoy . She can swim through riptides at up to 24 miles per hour. Her inventor, Tony Mulligan, says that's 15 times as fast as human lifeguards! EMILY is powered by a tiny electric pump and operated by remote control. 
 Question: How many environment-friendly inventions are mentioned in the passage?

Ex Output:
three.


Ex Input:
Context: What did the arrival of the Internet and 24 hours news mean for British newspapers? At first, this looked like the end of printed newspapers. The national newspapers were worried that they would lose all the readers, so most of them decided to create an online version . But they still had a problem. How to make money? There was simply too much news and too much information freely available "out there". But was it accurate ( )? Whose opinions should we trust? A survey for a "good newspaper", and most of those said.they believe more of what they read in paid-for newspapers. Here was something newspapers understood--here was what they could offer: news plus comment and opinion. And the Internet now offered new opportunities. A newspaper was just that: news printed on paper. But the Internet now offered newspapers different places to print, and in different media. Many newspapers now have podcasts and video too. This may explain why the readership of newspaper online in the UK is very different from people who read printed newspapers. The most popular newspaper in the UK is The Sun, The "mid-market" audience mainly reads The Daily Mail. Online, it's a different story. The most popular is The Mail. And the next popular site is TheGuardian. In fact many of these browsers are not from the UK. The Mail and Guardian are among the most read newspapers in the USA. The Guardian, may become the largest English language paper on the web; a website with a newspaper attached! 
 Question: The largest English language paper on the Internet may be .

Ex Output:
the guardian


Ex Input:
Context: Infections generally occur in intravenous drug abuse (IVDA) patients, most commonly affecting the spine and proximal joints. Numerous serious musculoskeletal complications of IVDA may involve the upper extremity, however. Soft-tissue complications in the upper extremity of IVDA patients include cellulitis, ulceration, abscess, pyomyositis, septic bursitis, tenosynovitis, and necrotizing fasciitis. Foreign bodies in soft tissue due to needle fragments are common findings. Primary bone and joint IVDA complications include osteomyelitis (acute and chronic) and septic arthritis. Other IVDA complications in the upper extremity affecting blood vessels and lymphatics include hematoma, arterial aneurysm and pseudoaneurysm, thrombosis, thrombophlebitis, "puffy hand" syndrome, and lymphadenopathy. These complications usually present as urgent issues requiring prompt and accurate evaluation in the acute setting. Diagnostic imaging not only aids in making the correct diagnosis but also permits precise definition of the location and extent of these abnormalities. We review the imaging findings and illustrate a wide range of disabling and even life-threatening complications affecting the upper extremity of IVDA patients that require early diagnosis for optimal outcome. 
 Question: What causes "Puffy hand syndrome"?

Ex Output:

intravenous drug abuse