Definition: In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as `a` for Yes or `b` for No.
Input: Question: When did Citadel Media become Cumulus Media Networks? Passage:KVOB started as KQNS-FM in September 1988, then located on 95.9 FM with an ERP of 1.3 kW. At the time, the station carried an adult contemporary format. In 1994, B-B Broadcasting bought the station from Smoky Hill Broadcasting, and the following year, the station moved to 95.5 FM and upgraded their power to 15.5 kW. By this time, the station flipped to a mainstream rock format, branded as "Star 95." In 1999, the station flipped back to adult contemporary, keeping the "Star 95" moniker. In 2004, the station began running the "Hits & Favorites" satellite feed from Citadel Media (now Cumulus Media Networks) and changed monikers to "Lite Rock 95.5". A year later, the station switched satellite feeds to Westwood One's AC feed, again keeping the "Lite Rock 95.5" moniker. In 2006, the station rebranded as "OZ 95", again keeping the AC format. In 2007, the station flipped to adult hits, branded as "Bob FM". The station was assigned the KVOB call sign by the Federal Communications Commission on December 1, 2007. A year later, the station switched to Sparknet Communications' national feed of "Jack FM", again retaining the adult hits format.


b