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
What is the duration of "new families"? 
Select and explain. 
A. < 2 years, B. < 5 years, C. < 10 years, D. < 12 years
C: < 10 years
Answer: C: < 10 years 
Explanation: New family is a term applied to those under 10 years duration and consists of parents and children. Ref: Park 21st edition page: 633.