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 so-called ‘health tourism gap’ between the amount the NHS collects from EU patients and the total hospitals on the continent receive from Britain has soared to almost £700million (file picture) Hospitals’ failure to claw back the cost of treating Europeans is costing taxpayers millions of pounds a week, figures suggest. The so-called ‘health tourism gap’ between the amount the NHS collects from EU patients and the total hospitals on the continent receive from Britain has soared to almost £700million. It means the UK is now paying out £15 for the healthcare costs of Britons who fall ill abroad for every £1 it gets back for the NHS treatment of European visitors.Hospitals still failing to claw back the cost of treating Europeans on NHSComes as the health tourism gap soars to almost £700million a yearUK now pays £15 for healthcare costs for Britons who fall ill abroadBut in return it only receives £1 from foreigners who get NHS treatmentPM and Health Secretary have pledge to introduce measures to recoup cost 
 Question:Under EU arrangements, _ citizens can be treated by other nations’ health services and the bill is sent back to Britain.

Britain