General Medicine General abd4102c A 15-year-old girl c/o failure to attain menarche. Her height is 4 feet. She has not yet developed secondary sexual characteristics. If USG shows uterus and vagina. FSH and LH levels are high. What is the best step in confirming the diagnosis? A Perform a CT B Perform a Karyotype C Perform a buccal smear D Perform progesterone withdrawal test