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: During active transport, molecules move from an area of low concentration to an area of high concentration. This is the opposite of diffusion, and these molecules are said to flow against their concentration gradient. Active transport is called "active" because this type of transport requires energy to move molecules. ATP is the most common source of energy for active transport. As molecules are moving against their concentration gradients, active transport cannot occur without assistance. A carrier protein is always required in this process. Like facilitated diffusion, a protein in the membrane carries the molecules across the membrane, except this protein moves the molecules from a low concentration to a high concentration. These proteins are often called "pumps" because they use energy to pump the molecules across the membrane. There are many cells in your body that use pumps to move molecules. For example, your nerve cells (neurons) would not send messages to your brain unless you had protein pumps moving molecules by active transport. The sodium-potassium pump ( Figure 1.1) is an example of an active transport pump. The sodium-potassium pump uses ATP to move three sodium (Na+ ) ions and two potassium (K+ ) ions to where they are already highly concentrated. Sodium ions move out of the cell, and potassium ions move into the cell. How do these ions then return to their original positions? As the ions now can flow down their concentration gradients, facilitated diffusion returns the ions to their original positions either inside or outside the cell. 
 Question: which statement is true concerning active transport?
Example Output: during active transport, molecules move from an area of low concentration to

Example Input: Context: Ceraunius Tholus is a volcano on Mars located in the Tharsis quadrangle at 24.25 north latitude and 262.75 east longitude, part of the Uranius group of volcanoes. 
 Question: On what moon or planet can Ceraunius Tholus be found?
Example Output: mars

Example Input: Context: In New York City public schools, 176 different languages are spoken among the more than 1 million students. For 160,000 children, English is not their first language. New York's Department of Education makes learning better for these students by providing dual-language programs, in which students are taught in two languages, English and another one, like Russian or Chinese. Math, social studies, science and all other regular courses are taught in both languages. And they learn about the culture of the other country. Milady Baez, Deputy Chancellor of English Language Learners and Student Support, says these dual-language programs will help children succeed in the future. "The jobs of the future require that our students know more than one language. They are going to be traveling abroad; they are going to be communicating with people from all over the world. This will open doors for them." Middle-schoolers might not have jobs on their minds yet. For Kequing Jaing, she likes keeping up her first language, Mandarin."It makes me feel that I am home because I can speak in Chinese, learn in Chinese, while learning in English. So it makes me feel better and makes me understand more about the task I'm learning."[:ZSSxxSSk.Com] Anastasia Hudikova came to the United States when she was 2 years old. She says the Russian-English program keeps her connected to her heritage and her parents happy."They're really happy about the program. They are really happy that I can preserve my culture and my language, and that I can speak it fluently in school." The New York schools also offer dual-language programs in seven other languages: Arabic, French, Haitian Creole, Hebrew, Korean, Polish and Spanish. There are plans to add even more languages in the future. While these dual-language programs are popular, some organizations in the U.S. say teaching English comes first. U.S. Studies show that children who learn English early will be more successful later. 
 Question: Who may not quite agree with dual-language programs?
Example Output:
some organizations in the u.s