It depends on the query, but content type is a set of the types of all the locations containing useful information, for this specific query.
- Scenario A (Any one is enough): Sometimes the exact same information is repeated in multiple formats (e.g., a percentage is mentioned in the text and shown in a table or a chart). In this case, retrieving just one source is sufficient.
- Scenario B (You need both): For most queries, the answer must be pieced together from different sources. You would need to retrieve information from all the listed content types to construct the full answer.