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
Complete contraction of a family starts when 
Select and explain. 
A. Birth of last child, B. Last child leaves the home, C. 1st Spouse dics, D. Death of last child
B: Last child leaves the home
Answer: B: Last child leaves the home 
Explanation: None