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].

(CNN) A new study lends support to one of the biggest fears about Zika virus: It might increase the risk of the rare neurological syndrome Guillain-Barre. Years before Zika virus first appeared in Latin America, it spread from Africa and Asia to Pacific islands. From 2013 to 2014, French Polynesia had 32,000 suspected cases of Zika virus. During this same period, there was also an uptick in cases of Guillain-Barre. Researchers in French Polynesia and Europe looked at those 42 cases of Guillain-Barre in the Pacific Island nation between October 2013 and April 2014. They asked whether there was any evidence these patients had been exposed to Zika virus.A study finds evidence that people in French Polynesia affected by Guillain-Barre were exposed to Zika virusResearchers estimate that about 1 in 4,000 Zika infectious could lead to the rare neurological syndromeGuillain-Barre causes muscle weakness and paralysis, and many patients take weeks to months to recover 
 Question:The researchers estimate, based on the rates of _ and Guillain-Barre in French Polynesia, that one in 4,000 people infected with Zika could develop the neurological syndrome.
Zika

Nicolas Hamilton, the younger brother of Formula One world champion Lewis Hamilton, is to compete in this season’s British Touring Car Championship. Hamilton, who has cerebral palsy, will make his debut in June and becomes the first disabled driver to compete in the series. The 22-year-old will take part in five of the 10 rounds at Croft, Snetterton, Rockingham, Silverstone and the final meeting of the championship at Brands Hatch. Scroll down for video... Nicolas Hamilton posed a picture with his British Touring Car. The Briton said 'it's been a tough few months' Nicolas Hamilton, pictured with his older brother Lewis at the Indian Grand Prix in 2013Nicolas Hamilton will take part in five of the 10 championship roundsThe 22-year-old lives with the neurological condition cerebral palsyHe competed in the Renault Clio Cup in 2011 and 2012Nicolas is the younger brother of F1 world champion Lewis Hamilton 
 Question:Nicolas' brother Lewis Hamilton is bidding to become the first _ to successfully defend his Formula One title.
Briton

West Ham manager Sam Allardyce believes filling your home ground is paramount to Premier League clubs - with the Hammers announcing their new season-ticket structure ahead of the move to the Olympic Stadium. Karren Brady, vice-chairman of West Ham, announced during the week that the club would be making significant cuts to their current pricing as the move is being offset against increased television revenue. The cheapest season ticket at Upton Park is £620 but there will be £289 seats on offer from the 2016-17 season - the club's first in the 54,000-seater Olympic Stadium. West Ham's season tickets will cost as little as £289 when the club move to the Olympic Stadium next yearWest Ham move to the Olympic Stadium ahead of the 2016-17 seasonKaren Brady announced reduced season ticket prices ahead of moveCheapest price will be £289, down from the current cheapest of £620Sam Allardyce says filing the stadium is most important thing for a club 
 Question:That will only encourage future young West Ham supporters to be _ supporters.'

West Ham