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A 9-year-old girl presents for evaluation of regular vaginal bleeding. History reveals thelarche at age 7 and adrenarche at age 8. The most common cause of this condition in girls is

a. Idiopathic

b. Gonadal tumors

c. McCune-Albright syndrome

d. Hypothyroidism

e. Tumors of the central nervous system

in Ob/Gyn by

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a. Idiopathic