This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
Sex ratio is 
Select and explain. 
A. 1 male per 1000 females, B. 1000 females for 1000 males, C. Number of female for 1000 males, D. 1000 females per 100000 males
C: Number of female for 1000 males
Answer: C: Number of female for 1000 males 
Explanation: Sex ratio is defined as the number of females per 1000 males. It is one of the basic demographic characteristic of a population. Reference : Park&;s textbook of preventive and social medicine, 23rd edition, pg no:482