The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 17-year-old girl is brought to the physician because she has not attained menarche. There is no personal or family history of serious illness. She is 168 cm (5 ft 5 in) tall and weighs 63 kg (139 lb); BMI is 22.3 kg/m2. Examination shows normal breast development. Scant axillary hair is present. Abdominal examination shows a firm, nontender left inguinal mass. Pelvic examination shows a blind vaginal pouch. Ultrasonography does not show a uterus or ovaries. Which of the following is the most likely underlying cause of this patient's symptoms?   (A) 5-α reductase deficiency   (B) Sex chromosome mosaicism   (C) Sex chromosome monosomy   (D) Androgen insensitivity
['(D) Androgen insensitivity <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 5-α reductase deficiency \n (B) Sex chromosome mosaicism \n (C) Sex chromosome monosomy \n (D) Androgen insensitivity <> possible answers', "  A 17-year-old girl is brought to the physician because she has not attained menarche. There is no personal or family history of serious illness. She is 168 cm (5 ft 5 in) tall and weighs 63 kg (139 lb); BMI is 22.3 kg/m2. Examination shows normal breast development. Scant axillary hair is present. Abdominal examination shows a firm, nontender left inguinal mass. Pelvic examination shows a blind vaginal pouch. Ultrasonography does not show a uterus or ovaries. Which of the following is the most likely underlying cause of this patient's symptoms? <> context@"]