<prompt> Which one of the following is not a feature of Turner;s syndromeSho statureMental retardationCoarctation of aoaLymphedema  <response>: Key clinical features of Turner syndrome are a lack of breast development or amenorrhea, with elevated follicle-stimulating hormone levels by 14 years of age; and infeility in women. Other characteristics of Turner syndrome include sho stature, a webbed neck, a low posterior hairline, misshapen or rotated ears, a narrow palate with crowded teeth, a broad chest with widely spaced nipples, cubitus valgus, hyperconvex nails, multipigmented nevi, pubeal delay, and cardiac malformation. 