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: An electric transformer is a device that uses electromagnetic induction to change the voltage of electric current. Electromagnetic induction is the process of generating current with a magnetic field. It occurs when a magnetic field and electric conductor, such as a coil of wire, move relative to one another. A transformer may either increase or decrease voltage. You can see the basic components of an electric transformer in the Figure 1.1. Click image to the left or use the URL below. URL: The transformer in the diagram consists of two wire coils wrapped around an iron core. Each coil is part of a different circuit. When alternating current passes through coil P, it magnetizes the iron core. Because the current is alternating, the magnetic field of the iron core keeps reversing. This is where electromagnetic induction comes in. The changing magnetic field induces alternating current in coil S of the other circuit. Notice that coil P and coil S in the Figure 1.1 have the same number of turns of wire. In this case, the voltages of the primary and secondary currents are the same. Usually, the two coils of a transformer have different numbers of turns. In that case, the voltages of the two currents are different. When coil S has more turns than coil P, the voltage in the secondary current is greater than the voltage in the primary current (see Figure 1.2). This type of transformer is called a step-up transformer. Thats because it steps up, or increases, the voltage. When coil S has fewer turns of wire than coil P, the voltage in the secondary current is less than the voltage in the primary current (see Figure 1.3). This type of transformer is called a step-down transformer because it steps down, or decreases, the voltage. Q: Both step-up and step-down transformers are used in the electrical grid that carries electricity from a power plant to your home. Where in the grid do you think step-down transformers might be used? A: One place that step-down transformers are used is on the electric poles that supply current to homes. They reduce the voltage of the electric current before it enters home circuits. 
 Question: an electric transformer contains

Ex Output:
an iron core.


Ex Input:
Context: Rachel (Andrea Bowen), a high school girl, seems to have the life that most people envy: she has a steady boyfriend, some great friends, and a place on the school's soccer team. Preparing for college and separating from her boyfriend are the main worries of this teen, as she lives a carefree life like most girls her age. However, Rachel's world falls apart the day she discovers that Jason (Eric von Detton), a former sexual partner of hers that died an untimely death, was in fact HIV positive and an IV drug user. She immediately goes to an AIDS clinic to get a rapid test, which unfortunately comes back positive. Devastated by the fact that she may actually be infected with the virus, Rachel then confides in her substitute teacher, Sarah (Jennie Garth), who has secretly been living with the disease for years. But both young women are about to find out their secrets will not be kept secret for very long, as word begins to spread throughout their high school and rumors fly, making some of these students realize that they may not be as "clean" as they think they are. 
 Question: What were the results of Rachel's rapid test at the AIDS clinic?

Ex Output:
positive


Ex Input:
Context: The Steelers' ninth game was an AFC duel with the Patriots. The Steelers trailed early as QB Tom Brady made a 19-yard TD pass to TE Rob Gronkowski. This was followed by kicker Shayne Graham getting a 31-yard field goal. The Steelers responded in the second quarter with kicker Jeff Reed nailing a 22-yard field goal. The Steelers struggled further when Brady threw another TD pass to Gronkowski, this one from 9yards out. That was followed by Brady's scramble 3yards to the endzone for a touchdown (With a failed PAT as the kick went wide-right). The Steelers scored first in the 4th quarter when QB Ben Roethlisberger completed a 6-yard TD pass to WR Emmanuel Sanders. The Steelers looked to create another scoring drive, but it came to a halt when Roethlisberger's pass was intercepted by SS James Sanders and returned 32yards for a touchdown (With a failed 2-point conversion). The Steelers tried to cut the lead with a Roethlisberger 15-yard TD pass to WR Mike Wallace, but the Patriots replied with Brady getting a 25-yard TD pass to Gronkowski. Again the Steelers tried to get closer when Roethlisberger completed a 33-yard TD pass to Wallace, but the Patriots put the game away after Graham hit a 36-yard field goal. 
 Question: Who caught the first touchdown pass of the game?

Ex Output:

gronkowski