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
Maternal moility rate is: 
Select and explain. 
A. Maternal death/100 bihs, B. Maternal death/100 live bihs, C. Maternal death/1000 bihs, D. None
D: None
Answer: D: None 
Explanation: Ans. is 'None'