In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".

[EX Q]: Density is also an important physical property of matter. The concept of density combines what we know about an objects mass and volume. Density reflects how closely packed the particles of matter are. When particles are packed together more tightly, matter is more dense. Differences in density of matter explain many phenomena. It explains why helium balloons rise. It explains why currents such as the Gulf Stream flow through the oceans. It explains why some things float in or sink. You can see this in action by pouring vegetable oil into water. You can see a colorful demonstration in this video. <sep>What physical property of matter combines what we know about an object's mass and volume?<sep>Gravity
[EX A]: No

[EX Q]: Representing yourself in court can be a tricky endeavor. There are confusing legal terms to learn, strict procedures to follow and volumes of case law that often need to be understood to prepare a case. Lake County officials and a private agency that assists indigent litigants in Illinois want to make the practice easier by creating a self-help center for people who choose to represent themselves in legal matters. The center, which will be housed in the law library at the main courthouse in Waukegan, could open later this summer. "I think it's going to be extremely helpful," Court Administrator Bob Zastany said. "There is a population out there that will take advantage of this resource." The self-help center will be the only one of its kind in the county. Only a few operate nationwide, officials said. The project is the work of Lake County circuit court officials and Prairie State Legal Services, a statewide agency with an office in Waukegan that provides information and legal assistance to poor and elderly Illinois residents. The organization has received a $25,000 grant from the Illinois Equal Justice Foundation, a nonprofit group that funds programs designed to increase access to legal information and assistance, to help pay for the effort. Prairie State will share the money with the county. The county's law library is on the first floor of the governmental center at 18 N. County St. The new self-help center will be designed to help litigants find the information they need to properly represent themselves in court, an undertaking that can be complicated and confusing. "Some people can do OK on their own, and some people can do OK with some help," said Linda Rothnagel, the managing attorney for Prairie State Legal Services. "But other people can't do it. It's not always easy." Self-representation is a right affirmed by the U.S. Supreme Court. The practice is far more common in civil matters than in criminal cases. In fact, self-represented litigants - formally called "pro se" in Latin, or "for oneself" - in criminal defenses are so rare that statistics about the practice generally are not kept, legal experts say. <sep>What does Court Administrator Bob Zastany think is going to be extremely helpful?<sep>The presence of the self-help center
[EX A]: Yes

[EX Q]: Milwaukee, Wisconsin (CNN) -- President Barack Obama, in a bid to create jobs and boost economic growth, called on Congress on Monday to pass a $50 billion plan to renew the country's transportation infrastructure. His address was the first of two speeches the president is scheduled to make this week to frame his administration's ongoing response to the recession, less than two months ahead of midterm elections in which Democratic majorities in the House and Senate are in jeopardy. "Today, I am announcing a new plan for rebuilding and modernizing America's roads, and rails and runways for the long term," said Obama, who spoke on Labor Day in Milwaukee, Wisconsin -- a state with competitive gubernatorial and U.S. Senate races. "We used to have the best infrastructure in the world. We can have it again," he said to loud cheers from a crowd of union workers. The proposal envisions -- over a six year period -- rebuilding 150,000 miles of roads, 4,000 miles of rail and 150 miles of airport runways. It also would include modernizing the nation's air traffic control system in an effort to reduce delays and travel time. "This will not only create jobs immediately. It's also going to make our economy hum over the long haul," said the president. Obama hopes to work with Congress to enact an up-front investment of $50 billion -- an amount a White House statement said would represent a significant chunk of new spending on infrastructure. The investment would then be paired with what the administration called a framework to improve transportation spending. The long-term plan would include the establishment of an Infrastructure Bank, which would leverage federal dollars and focus on projects that could deliver the the biggest bang for the buck, Obama said. The president stressed the need for Democrats and Republicans to work together on the transportation initiative, which would need to be approved by Congress. <sep>On behalf of his administration, what is the overt cause and what is the implied cause of why President Obama gave a speech about spending $50 billion on renewing the country's transportation infrastructure?<sep>Overt: To modernize the roads and repair roads, rails, and runways. Implied: To ensure the Republican majority of the House and Senate before midterm elections
[EX A]:
No

