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
Best indicator of availability, utilization & effectiveness of health services 
Select and explain. 
A. MMR, B. IMR, C. Hospital bed occupancy rate, D. DALY
B: IMR
Answer: B: IMR 
Explanation: None