Top actors Rakul Preet Singh, Rana Daggubati and 10 others will be questioned in a four-year-old drugs case, sources have said. The Enforcement Directorate has summoned Rakul Preet Singh on September 6, Baahubali actor Rana Daggubati on September 8, Telugu actor Ravi Teja on September 9 and director Puri Jagannadh on September 31.