Question: When is the director of film Gaja Donga 's birthday?
Sentence (from "Gaja Donga"): Gaja Donga  is a 1981 Telugu Action crime film, produced by Chalasani Gopi and K. Nageswara Rao under the Vijaya Durga Art Pictures banner and directed by K. Raghavendra Rao.
Relevant evidence: Yes