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In this paper we investigate the use of several types of lexico-semantic information for query expansion in the passage retrieval component of our QA system. We have used four corpus-based methods to acquire semantically related words, and we have used one hand-built resource. We evaluate our techniques on the Dutch CLEF QA track. In our experiments expansions that try to bridge the terminological gap between question and document collection do not result in any improvements. However, expansions bridging the knowledge gap show modest improvements.

Using lexico-semantic information for query expansion in passage retrieval for question answering