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: Restless leg syndrome (RLS) is a sensorimotor disorder. Clinical studies have implicated the dopaminergic system in RLS, while others have suggested that it is associated with insufficient levels of brain iron. To date, alterations in brain iron status have been demonstrated but, despite suggestions from the clinical literature, there have been no consistent findings documenting a dopaminergic abnormality in RLS brain tissue. In this study, the substantia nigra and putamen were obtained at autopsy from individuals with primary RLS and a neurologically normal control group. A quantitative profile of the dopaminergic system was obtained. Additional assays were performed on a catecholaminergic cell line and animal models of iron deficiency. RLS tissue, compared with controls, showed a significant decrease in D2R in the putamen that correlated with severity of the RLS. RLS also showed significant increases in tyrosine hydroxylase (TH) in the substantia nigra, compared with the controls, but not in the putamen. Both TH and phosphorylated (active) TH were significantly increased in both the substantia nigra and putamen. There were no significant differences in either the putamen or nigra for dopamine receptor 1, dopamine transporters or for VMAT. Significant increases in TH and phosphorylated TH were also seen in both the animal and cell models of iron insufficiency similar to that from the RLS autopsy data. For the first time, a clear indication of dopamine pathology in RLS is revealed in this autopsy study. The results suggest cellular regulation of dopamine production that closely matches the data from cellular and animal iron insufficiency models. The results are consistent with the hypothesis that a primary iron insufficiency produces a dopaminergic abnormality characterized as an overly activated dopaminergic system as part of the RLS pathology. 
 Question: Which deficiency is the cause of restless leg syndrome?

Ex Output:
iron


Ex Input:
Context: Pat came over from Ireland to England with his wife one year ago to find work. He got quite a good job with a building company, and as he did not drink or smoke, he saved up quite a lot of money. His wife's parents were still in Ireland, and one day she got a telegram saying that her mother was ill, so Pat gave her some money and she went to Ireland to see her mother. After a week, Pat wanted to write a letter to her, but he could not read or write very well, so he went to his priest and asked him to do it for him. Pat told the priest what he wanted to say, and the priest wrote it down. After a few minutes Pat stopped, and the priest said," Do you want to say more?" "Only ," 'Please excuse the bad writing and spelling'," Pat said. 
 Question: Who really made a mistake in the story?

Ex Output:
pat.


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 made the winning move

Ex Output:

graham