Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: This author discussed an inexperienced girl, who marries a syphilitic man and is told by the church that she cannot get divorced or use birth control, in a work that claims that religion is based on fear. In another work, he discussed two meanings of the phrase "the present King of France is not bald." The paradox of this author of "On Denoting" asks whether the set of all sets that do not contain themselves contains itself. For 10 points, name this author of "Why I Am Not a Christian" who collaborated with Alfred North Whitehead on Principia Mathematica.
A:
Social Science