<prompt> Regarding sexual differentiation of the fetusGonadal development begins at 5th week of intrauterine lifeY chromosome determines the differentiation of ovariesFemale external genitalia development is completed by 10 weeksMale sexual differentiation occurs earlier than females  <response>: OptionB: SRY Gene located on Y chromosome encodes Testis Determining Factor which leads to the development of male genital organs Option CD: Development of external genitalia is similar in males and females till the 6th week of IULIndifferent stage...later develops in the direction of hormones. REFERENCE: TEXTBOOK OF CLINICAL EMBRYOLOGY... VISHRAM SINGH SECOND EDITION..PAGE NO:277 