Problem: Hagrid's 'cowardly' boarhound, of Harry Potter fame?
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A: fang

Problem: Which city was the capital of the Republic of Vietnam, which governed the southern half of Vietnam until 1975 the name at the time is needed?
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A: saigon

Problem: Fallopia japonica is a pernicious weed spreading through roots and tubers found in various wild places, particularly damp ones, in the UK. What is its more common name?
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A: japanese knotweed

Problem: What 1968 film features the characters Caractacus Potts and Truly Scrumptious?
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A:
chitty chitty bang bang