3. The method of claim 1 , wherein obtaining information about the topic further comprises: assigning the topic to one or more categories; and determining whether the topic is ambiguous based on the one or more categories to which the topic is assigned.
3. The method of claim 1 , wherein obtaining information about the topic further comprises: assigning the topic to one or more categories; and determining whether the topic is ambiguous based on the one or more categories to which the topic is assigned. 5. The method of claim 3 , wherein obtaining information about the topic further comprises: receiving search results as a result of searching the multiple sources, the search results comprising documents corresponding to the search query; and extracting the excerpts from a subset the documents.