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: The direct thrombin inhibitor dabigatran and the anti-Xa agents rivaroxaban, edoxaban, and apixaban are a new generation of oral anticoagulants. Their advantage over the vitamin K antagonists is the lack of the need for monitoring and dose adjustment. Their main disadvantage is currently the absence of a specific reversal agent. Dabigatran's, unlike the anti-Xa agents, absorption can be reduced by activated charcoal if administered shortly after ingestion and it can be removed from the blood with hemodialysis. Prothrombin complex concentrate, activated prothrombin complex concentrate, and recombinant factor VIIa all show some activity in reversing the anticoagulant effect of these drugs but this is based on ex vivo, animal, and volunteer studies. It is unclear, which, if any, of these drugs is the most suitable for emergency reversal. Three novel molecules (idarucizumab, andexanet, and PER977) may provide the most effective and safest way of reversal. These agents are currently in premarketing studies. 
 Question: Idarucizumab is an antidote of which drug?

Ex Output:
dabigatran


Ex Input:
Context: Hoping to snap a three-game losing streak, the Chiefs went home for a Week 12 Sunday night duel with the Pittsburgh Steelers. Kansas City delivered the game's first punch in the opening quarter with a 41-yard field goal from kicker Ryan Succop. The Steelers would answer in the second quarter with kicker Shaun Suisham getting a 21-yard field goal, followed by quarterback Ben Roethlisberger completing a 2-yard touchdown pass to tight end Weslye Saunders. The Chiefs would reply with a 49-yard field goal from Succop, but Pittsburgh would close out the half with Suisham booting a 49-yard field goal. After a scoreless third quarter, Kansas City began to chip away at their deficit in the fourth quarter with a 40-yard field goal from Succop. However, the Steelers' defense held on to preserve the win. 
 Question: What was able to save the win for the Steelers'?

Ex Output:
defense held on


Ex Input:
Context: The Pier 21 Society opened an interpretive centre in part of the former immigration facility in 1999. 
 Question: What year was Pier 21 opened?

Ex Output:

1999