Passage: The badminton tournaments at the 2016 Summer Olympics in Rio de Janeiro took place from 11 to 20 August at the fourth pavilion of Riocentro. A total of 172 athletes competed in five events: men's singles, men's doubles, women's singles, women's doubles, and mixed doubles.Similar to 2012 format, a combination of group play and knockout stages had been maintained at these Games. In all the doubles tournaments, the Badminton World Federation instituted several changes to the competition rules after the match fixing scandal from the previous Olympics, as all pairs finishing second in their groups would be placed into another draw to determine who they face in the next round, while the top pair in each group must have a fixed position matched to its designated seed in the knockout phase.The Games made use of about 8,400 shuttlecocks.

Question: In what pavilion in Riocentro did the badminton tournaments take place?
fourth