Task: Text Categorization
Input (English): Context: Rainbow 7 (レインボー7) is the seventh album by the J-pop idol group Morning Musume. It is the first album to feature 7th generation member Koharu Kusumi and was released on February 15 2006.
Question: The document can be classified to which topic? 
Options: 1)WrittenWork, 2)Album, 3)MeanOfTransportation, 4)Village, 5)Plant
Output (English): 2