challenge: Who were the producers of BG Rock, the first solo album by Georgi Minchev?
  
  A. Petar Slavov and Ivaylo Kraychovski
  B. Georgi Minchev and Balkanton
  C. Ivaylo Kraychovski and Balkanton
  D. Georgi Minchev and Petar Slavov
  Answer: 