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: (CNN) -- The plan to embalm the body of Venezuelan President Hugo Chavez may have hit a snag. Scientists in a preliminary assessment have determined that the process might be "quite difficult," acting president Nicolas Maduro said Wednesday. Maduro said at the opening of the Book Fair of Venezuela that scientists argued that "the decision should have been taken much earlier." He didn't say why -- but added that Chavez will always remain in Venezuela's collective memory "More than your physical body, we have the commander in eternal memory, especially this generation who heard it, touched it, saw him," Maduro told the audience. "We have to keep alive his image, his voice, his thinking."Chavez died this month after a battle with cancerThe original plan was to embalm ChavezScientists say embalming Chavez may be difficult 
 Question:_ filed papers Monday to officially register to run for president.

Nicolas Maduro