Problem: What is the name of the central character, a Harvard professor of religious iconology and symbology, in Dan Brown's novels 'Angels And Demons' and 'The Da Vinci Code'?
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A: robert langdon

Problem: Sir Seretse Khama was from 1966 to 1980 the first President of which African country?
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A: botswana

Problem: Who was the chief harpooner on Captain Ahab's whaleship?
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A: queequeg

Problem: What element is also known as hydrargyrum?
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A:
mercury