A genetic male who does not produce enough of a hormone called dihydrotestosterone may have external genitalia that appear female. This condition is most likely caused by

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5-alpha reductase deficiency can lead to a genetic male appearing female due to a lack of dihydrotestosterone, which is normally produced from testosterone through the action of 5-alpha reductase. This deficiency can result in incomplete masculinization of the external genitalia. Klinefelter syndrome (A) involves an extra X chromosome and can lead to male infertility, but typically does not directly affect genital development. Too much androgen (C) would typically result in masculinization of the external genitalia. Too much progesterone (D) would not directly affect genital development in a male.

A Genetic Male Who Does Not Produce Enough of a Hormone