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Review Question - QID 214516

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QID 214516 (Type "214516" in App Search)
A 16-year-old girl presents to her pediatrician because she is concerned that she has not yet had a menstrual period. She was born at term and met all developmental milestones. She has no past medical history and does not take any medications. On presentation, her temperature is 98.6°F (37°C), blood pressure is 118/72 mmHg, pulse is 81/min, and respirations are 11/min. On physical exam, she appears to be Tanner stage 4, and speculum exam reveals a vagina that ends in a blind pouch. No masses are felt in the inguinal canal, and transvaginal ultrasound reveals a normal adnexal appearance. Which of the following is the most likely cause of this patient's presentation?