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
Stage of contraction of family stas at ? 
Select and explain. 
A. Marriage, B. Bih of first child, C. Bih of last child, D. Leaving home of first child
D: Leaving home of first child
Answer: D: Leaving home of first child 
Explanation: Ans. is `d' i.e., Leaving home of first child