challenge: Who joined Tatsuya Yoshida on the Ruins album Symphonica?
  
  A. Kenichi Oguchi and two female singers, as well as Hisashi Sasaki
  B. Kenichi Oguchi and two male singers
  C. Emi Eleonola and Aki Kubota, but no keyboard player
  D. Hisashi Sasaki and a single female singer
  Answer: 