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: Social & Preventive Medicine
In a community of 5000 people, the crude bih rate is 30 per 1000 people. The number of pregnant females is? 
Select and explain. 
A. 150, B. 65, C. 175, D. 200
A: 150
Answer: A: 150 
Explanation: 150 REF: Park 20th edition page 418 Crude bih rate = (Number of liver bihs in a year/ Estimated mid year population) x 1000 30 = (Live bihs/ 5000) x 1000 Live bihs = 150 (indirectly indication the number of pregnancy)