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. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.

Input: Consider Input: (CNN) Since the discovery of dark streaks on the slopes of Mars in 2011, astronomers have been excited about potential evidence of water beneath the surface of the red planet. If there are subsurface water flows on Mars, they could allow life -- even on a microbial level -- to exist as well. But further study of these recurring slope lineae, known as RSL, is revealing something else. Those dark streaks may be the result of granular flows like sand and dust, according to a study published Monday in the journal Nature Geoscience. The study is the product of a research team made up of representatives from the US Geological Survey, the Planetary Science Institute, the University of Arizona and Durham University in England.The flows correlate more with sand on active dunes rather than subsurface waterResearchers studied flows at 10 sites 
 Questions:Earth is the only analog we have for _, but Mars obviously behaves differently, the researchers said. (A) CNN (B) Mars (C) RSL (D) Nature Geoscience (E) US Geological Survey (F) Planetary Science Institute (G) University of Arizona (H) Durham University (I) England

Output: (B)


Input: Consider Input: NASA has given the people of Earth a rare treat: A color mosaic that captures not only Saturn, but also the tiny dots of Earth and other planets in the background. The panorama, released Tuesday, was captured by the Cassini spacecraft on July 19, when the sun slipped behind the ringed planet. Earth appears as a bright blue dot to Saturn's lower right, just above Saturn's outer, halo-like E-ring. Venus is a dot to the upper left, with Mars appearing as a faint red dot above and to the left of Venus. This is the first image in which Saturn, its moons and rings, and Earth, Venus and Mars are all visible, NASA said. The image -- a panorama of 141 wide-angle pictures -- covers 404,880 miles across Saturn and its ring system.Image is Cassini's first showing Saturn, rings, moons, Earth, Venus and Mars at same timeThe collage is panorama of 141 wide-angle pictures taken July 19Image was possible that day because Saturn obstructed spacecraft's view of sun 
 Questions:NASA hopes to have it continue to get more pictures and other data of _, its rings and moons through 2017. (A) NASA (B) Earth (C) Saturn (D) Cassini spacecraft (E) Venus (F) Mars (G) Cassini

Output: (C)


Input: Consider Input: A mother and daughter who decided to have breast implants together found themselves facing medical bills of nearly £20,000 when both surgeries were botched. Tracey Ahmet, 45, and Margaret Hall, 64, from Romford, Essex, opted to enhance their assets from a B cup to a D. However the former care worker and her retired mother Margaret, 64, were shocked to discover their implants contained mattress filler - with daughter Tracey's breasts rupturing twice. The pair were victims of the PIP (Poly Implant Prothese) scandal that affected 300,000 women across Europe and South America in 2012. Tracey said: 'We just wanted to treat ourselves and share the journey together. I wish we'd booked a holiday instead.'Tracey Ahmet, 45, and Margaret Hall, 64, were caught in PIP scandalDaughter Tracy's implants burst twice resulting in multiple surgeriesMother Margaret from Romford, Essex is too scared to have hers removed 
 Questions:Then when a report published in June 2012 revealed the problems with _, she feared the worst. (A) Tracey Ahmet (B) Margaret Hall (C) Romford (D) Essex (E) Margaret (F) Tracey (G) PIP (H) Europe (I) South America (J) Daughter Tracy (K) Mother Margaret


Output: (G)