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: Britain has evacuated its last special forces from Yemen because of the deteriorating security situation there. The move was confirmed by a source familiar with the matter who spoke to Reuters today and follows an announcement by US officials on Saturday that the country had evacuated its own remaining personnel, including about 100 special operations forces. US State Department spokesman Jeff Rathke said in a statement: 'Due to the deteriorating security situation in Yemen, the US government has temporarily relocated its remaining personnel out of the country.' Anti-Houthi protesters demonstrate in Yemen's southwestern city of Taiz today. Iran-backed Houthis took over the city on Sunday as violence intensifies with the group's continuing push southTroops airlifted from capital Sana'a amid deteriorating security situationUS evacuated its own remaining personnel on Saturday, official confirmedPolice troopers used tear gas to disperse anti-Houthi protesters in TaizSouthwestern city was taken over by Iran-backed Houthi rebels on SundayNorthern group continues to move south after taking capital in SeptemberCountry on brink of civil war which may involve neighbouring Saudi ArabiaISIS affiliates claimed responsibility for deadly bombs at Sana'a mosques 
 Question:Britain withdrew staff from its embassy in _ last month.

Yemen