challenge: Who were the joint winners of the Hoogovens Wijk aan Zee Steel Chess Tournament 1989?
  
  A. Bobby Fischer and Boris Spassky
  B. Viswanathan Anand, Predrag Nikolić, Zoltán Ribli and Gyula Sax
  C. Garry Kasparov and Anatoly Karpov
  D. Vladimir Kramnik and Veselin Topalov
  Answer: 