A dungeon entered by a trapdoor
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Cellar
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Oubliette
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Basement
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Gangway
B
Correct answer
Explanation
An oubliette is a specific type of dungeon accessible only through a trapdoor in its ceiling, designed to make prisoners difficult to escape. The name comes from French 'oublier' (to forget). A cellar and basement are storage spaces, while a gangway is a passage.