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
The risk of mongolism in a mother at the age 20 years is 1 : 000. what should be ratio when she is 45 yeas old : 
Select and explain. 
A. 4.208333333, B. 2.125, C. 0.763888889, D. None
D: None
Answer: D: None 
Explanation: Ans. is None According to 2/e high risk - Risk of mongolism is 1:32 while 3/e, p 33 says risk varies between 1:15 to 1:23 depending on the gestational age. The nearest answer is 1:50, so we are taking it as the correct option.