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 ceain population, there were 4050 bihs in the last one year. There were 50 still bihs, 50 infants died within 7 days whereas 150 died within the first 28 days. What is the neonatal moality rate 
Select and explain. 
A. 50, B. 62.5, C. 12.5, D. 49.4
A: 50
Answer: A: 50 
Explanation: Ans. a. 50