Q: Passage: Elizabeth Ann Theresa "Betty" Lynn (born August 29, 1926) is a former American actress. She is best known for her role as Thelma Lou, Deputy Barney Fife's girlfriend, on The Andy Griffith Show.

Question: Based on this passage, who played thelma lou on the andy griffith show?
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This is the relevant information: She is best known for her role as Thelma Lou, Deputy Barney Fife's girlfriend, on The Andy Griffith Show. So the answer is Elizabeth Ann Theresa '' Betty '' Lynn.