Up until about the third month after conception,
a. male fetuses possess a Wolffian system, and female fetuses possess a Müllerian system
b. male fetuses possess a Müllerian system, and female fetuses possess a Wolffian system.
c. male fetuses possess both a Müllerian system and a Wolffian system, and female fetuses possess a Müllerian system only.
d. male and female fetuses possess both a Müllerian system and a Wolffian system.
d
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