This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: obstetrics,pediatrics and geriatrics, Subject name: Social & Preventive Medicine
Child survival index is calculated by? 
Select and explain. 
A. 1000-IMR\/10, B. IMR -1000\/10, C. 1000-U5MR\/10, D. U5MR-1000\/10
C: 1000-U5MR\/10
Answer: C: 1000-U5MR\/10 
Explanation: Park's textbook of preventive and social medicine 23rd edition. *Child survival rate =(1000- under 5 moality rate)/10.