What type of entries are denoted by MARC tag 650?

The MARC tag 650 is specifically used for Subject Added Entries, which are essential for cataloging and organizing library materials. This tag helps to indicate the subject of the work, using established subject headings that allow users to find resources related to a particular topic easily. By including the subject added entries in the record, libraries can improve discoverability and enhance the user's ability to locate relevant materials based on their interests or research needs.

The other options refer to different aspects of cataloging. The local call number represents the specific identifier for a book in a particular library, while the title proper/statement of responsibility relates to the title information of the work itself. Physical description pertains to the bibliographic details concerning the format, size, and number of pages of the material being cataloged, which is not the focus of the MARC 650 tag. Thus, option B accurately reflects the purpose and function of the MARC tag 650.