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: Pediatrics
Gender from external genitalia of foetus becomes clearly distinguished by - 
Select and explain. 
A. 10 weeks, B. 16 weeks, C. 12 weeks, D. 20 weeks
A: 10 weeks
Answer: A: 10 weeks 
Explanation: Ans. is 'a' i.e., 10 weeks External genitals are distinguishable by 10th week of fetal life.