Read the text and determine if the sentence is true (see options at the end):

Judy Tegart Dalton (née Tegart; born 12 December 1937) is a retired professional tennis player from Australia who won nine Grand Slam doubles titles. She won at least one women's doubles title at each Grand Slam tournament, a "career Grand Slam". Five of her doubles titles were with Margaret Court. Tegart was the runner-up in 10 Grand Slam doubles tournaments.

Sentence: Judy Tegart Dalton retired from professional tennis due to a severe knee injury.
Options:
A). Yes.
B). It's impossible to say.
C). No.
B).