This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Fetal sex can be detected by USG at 
Select and explain. 
A. 20 weeks, B. 16 weeks, C. 18 weeks, D. 14 weeks
D: 14 weeks
Answer: D: 14 weeks 
Explanation: Male development is completed by 12 weeks and female development by 15 weeks
By 28 weeks,the testis descends to the internal inguinal ring.By 36 weeks, one testis and by 38-40 weeks both testes descend into scrotum
In female, the genital tubercle becones clitoris, the genital folds become the labia minora and the genital swellings became the labia majora