This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Social & Preventive Medicine
Calculate IMR if in a population of 100000 there are 3000 live bihs in a year and 150 infant deaths in the same year - 
Select and explain. 
A. 75, B. 18, C. 5, D. 50
D: 50
Answer: D: 50 
Explanation: Ref: Park 24th edition