Question: What item was used by Mariana Kovacevic to heal the football striker Asamoah Gyan during the 2012 African Cup of Nations?
Sentence (from "Mariana Kovacevic"): During the duration of the 2012 African Cup of Nations in Gabon and Equatorial Guinea she used the horse placenta treatment to heal Ghana's Asamoah Gyan, who had been injured and was supposed to be off football for four weeks.
Relevant evidence: Yes