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].

A nurse's release Tuesday from an Atlanta hospital leaves a single person in the United States now battling Ebola, though she and others -- including President Barack Obama -- stressed the fight against the deadly virus isn't over. "While this is a day for celebration and gratitude, I ask that we not lose focus on the thousands of families who continue to labor under the burden of this disease in West Africa," said 29-year-old Amber Vinson. About two weeks ago, Vinson became the second nurse from Texas Health Presbyterian Hospital Dallas to get the virus while caring for Thomas Eric Duncan, a Liberian man who began showing Ebola symptoms after arriving in Texas and died of it there. She and Nina Pham -- the other Dallas nurse who was discharged from a National Institutes of Health facility in Maryland on Friday -- are differ from the handful of other U.S. Ebola cases in the United States because they caught the disease in America, rather than contracting it in West Africa.Discharged nurse asks that we don't "lose focus" on those suffering in West AfricaU.S. cannot "react based on our fears," President Obama saysU.S. diplomat arrives in Liberia to show "solidarity"There's now only one person, a doctor in New York, with Ebola in the United States 
 Question:Even without more cases, _ remains a hot topic of conversation around the country.
Ebola

Nasa scientists say they have fixed a glitch that saw them lose contact with the New Horizon’s space probe just days before its close encounter with Pluto - and have released a new image of four unknown 'black spots' on the dwarf planet. The spacecraft entered ‘safe mode’, cutting contact with the Earth over the weekend, due to a timing flaw as it performed operations ahead of its fly past Pluto next week. Scientists leading the mission say they hope to return the space probe to full operation by Tuesday and the mission to fly within 7,750 miles (12,500km) of Pluto on July 14 will go ahead as planned.Nasa lost touch with the space probe for 89 minutes on Saturday 4 JulyNew Horizons' autopilot put spacecraft's main computer into 'safe mode'Scientists leading the mission hope to have it fully operation by 7 JulyNew Horizons is due to be the first spacecraft to fly past Pluto on July 14 
 Question:The three images together show the full extent of a continuous swath of dark terrain that wraps around much of _’s equatorial region.
Pluto

Virginia is poised to execute a convicted serial killer who claims he's intellectually disabled using lethal injection drugs from Texas because the state's supply of another controversial drug will expire the day before the execution is supposed to take place. Unless Gov. Terry McAuliffe or the U.S. Supreme Court steps in this week, Alfredo Prieto will be executed Thursday - the first Virginia inmate to be receive the death penalty in nearly three years. The El Salvador native was already facing execution in California for raping and murdering a 15-year-old girl when a Virginia jury sentenced him to death in 2010 for the 1988 killings Rachael Raver and her boyfriend, Warren Fulton III.Alfredo Prieto raped and murdered a 15-year-old girl in CaliforniaHe also murdered a Virginia couple in 1988 and will be executed ThursdayPrieto claims he has a 'significant brain dysfunction' from a malnourished childhood in El Salvador but psychologists say he is brightThe state will use a lethal three-drug cocktail partially supplied by TexasVirginia has executed 110 people since 1976, the third highest state 
 Question:_ officials agreed to send him to Virginia on the rationale that it was more likely to carry out the execution.

California