Krishna Forgets He Played Villain Role?

Has Superstar Krishna forgotten he had played the role of a villain in a movie or has he intentionally ignored it due to his reluctance of revealing the matter? On account of completion of 50 years of his journey as a film hero, Krishna gave interviews to newspapers and the same were published in today's newspapers. 

When a journo asked a question why he had not acted villain's role, Krishna said he did a negative shaded role in 'Manavudu Danavudu'. However, Krishna did not mention the movie 'Private Master', wherein he played full-fledged villain role in it. The movie had Rammohan as a hero and Kanchana and Sukanya played female leads. The film was directed by K Viswanadh.