This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2017, Subject name: Social & Preventive Medicine
Crude Bih rate for a sub-center is 20. What the number of pregnant woman registered in sub-center? 
Select and explain. 
A. 80, B. 100, C. 110, D. 60
D: 60
Answer: D: 60 
Explanation: Population of a sub-centre =5000 Crude bih rate= 20 per 1000 mid-year population Therefore, no. of bihs= 20/1000 x 5000=100 Pregnancy wastage factor = 10% (i.e. not all pregnancies result in a live bih, and roughly 10% ANC women have a "wastage" of their pregnancy. Therefore, total ANC= 100+ =110 As a thumb rule, Minimum number of ANC that should be registered at a time= 50%. - Min. No. registered in the sub-centre= 110 x 50/100=55 ~ ~60