Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: The teammate of a British IndyCar driver who died after he was struck in the head by a piece of debris during a race has called for fighter jet-style canopies to prevent similar accidents. British driver Justin Wilson was driving at the Pocono Raceway in Pennsylvania when he was hit by a large section of Sage Karam's car which had just ploughed into a wall during the race. Wilson was airlifted from the scene following the crash on Sunday but died the following day. Now his team mate Ryan Hunter-Reay has called on IndyCar organisers to review safety following the latest tragedy.The 37-year-old former Formula One driver Justin Wilson died on MondayHis team mate Ryan Hunter-Reay called the cars 'inherently dangerous'2009 British Formula One champion Jenson Button led tributes to WilsonEx-F1 and IndyCar champ Nigel Mansell also expressed his condolences 
 Question:However, Hunter-_ warned: 'These cars are inherently dangerous with the open cockpit like that, head exposed.

Reay