Problem: Given the question: Extract the answer to the question from the following context. Question: Joker is a __ Context: The problem of the direction of time arises directly from two contradictory facts. Firstly, the fundamental physical laws are time-reversal invariant; if a cinematographic film were taken of any process describable by means of the aforementioned laws and then played backwards, it would still portray a physically possible process. Secondly, our experience of time, at the macroscopic level, is not time-reversal invariant. Glasses can fall and break, but shards of glass cannot reassemble and fly up onto tables. We have memories of the past, and none of the future. We feel we can't change the past but can influence the future.
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The answer is:
film

Problem: Given the question: Extract the answer to the question from the following context. Question: What is John Harrison's last name? Context: Scholars continue to debate whether the U.S. Constitution adopted a particular interpretation of the "rule of law," and if so, which one. For example, John Harrison asserts that the word "law" in the Constitution is simply defined as that which is legally binding, rather than being "defined by formal or substantive criteria," and therefore judges do not have discretion to decide that laws fail to satisfy such unwritten and vague criteria. Law Professor Frederick Mark Gedicks disagrees, writing that Cicero, Augustine, Thomas Aquinas, and the framers of the U.S. Constitution believed that an unjust law was not really a law at all.
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The answer is:
Harrison

Problem: Given the question: Extract the answer to the question from the following context. Question: What makes it hard for racial groups at the bottom to get to the top? Context: Socioeconomic factors, in combination with early but enduring views of race, have led to considerable suffering within disadvantaged racial groups. Racial discrimination often coincides with racist mindsets, whereby the individuals and ideologies of one group come to perceive the members of an outgroup as both racially defined and morally inferior. As a result, racial groups possessing relatively little power often find themselves excluded or oppressed, while hegemonic individuals and institutions are charged with holding racist attitudes. Racism has led to many instances of tragedy, including slavery and genocide.
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The answer is:
Racial discrimination