Mary Margaret "Peggy" Wood (February 9, 1892 -- March 18, 1978) was an American actress of stage, film and television. She is best remembered for her performance as the title character in the CBS television series Mama (1949 -- 1957), for which she was nominated for a Primetime Emmy Award for Outstanding Lead Actress in a Drama Series; her starring role as Naomi, Ruth's mother-in-law, in The Story of Ruth (1960); and her final screen appearance as Mother Abbess in The Sound of Music (1965), for which she was nominated for an Academy Award and a Golden Globe Award.

Answer this question based on the passage: who played the reverend mother in the sound of music? Okie... think carefully first, then make a decision:
To answer the above question, the relevant sentence is: She is best remembered for her performance as the title character in the CBS television series Mama (1949 -- 1957), for which she was nominated for a Primetime Emmy Award for Outstanding Lead Actress in a Drama Series; her starring role as Naomi, Ruth's mother-in-law, in The Story of Ruth (1960); and her final screen appearance as Mother Abbess in The Sound of Music (1965), for which she was nominated for an Academy Award and a Golden Globe Award. So, the answer is Mary Margaret '' Peggy '' Wood.