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: UNITED NATIONS (CNN) -- The 15th anniversary of the genocide in Rwanda brought American U.N. Ambassador Susan Rice to tears as she reflected on her personal memories surrounding the slaughter. U.N. Ambassador Susan Rice recalls her time in Rwanda working for the Clinton administration. Rice visited Rwanda as a staff member in former President Bill Clinton's National Security Council six months after the ethnic cleansing. She explained how even months after the violence she encountered decomposing bodies at one of the massacre sites. "For me, the memory of stepping around and over those corpses will remain the most searing reminder imaginable of what our work here must aim to prevent," she said Tuesday at a special commemorative event at United Nations headquarters in New York.U.N. Ambassador Susan Rice recalls stepping over corpses in RwandaUnited Nations ceremony recalls 1994 mass killings in RwandaObama says tragedy must always be remembered 
 Question:President _ also released a statement coinciding with Tuesday's anniversary.

Obama