A 25-year-old woman sees her physician because of hirsutism (inappropriate hair growth)and excessive acne.During examination,her blood pressure is 150/90 mm Hg (elevated).Blood work reveals normal Na⁺ but low/normal K⁺ levels.Testosterone and dihydrotestosterone (DHT)levels are in the high end of the normal range,and levelso f DHEAS and ACTH are moderately elevated.Her physician suspects late-onset congenital adrenal hyperplasia resulting from subnormal activity of an adrenal enzyme.The "hyperplasia" associated with congenital adrenal hyperplasia is caused by elevated levels of:

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