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
Which is not a predisposing factor for carcinoma cervix? 
Select and explain. 
A. Single child birth, B. Early coitus, C. Early child bearing, D. Early marriage
A: Single child birth
Answer: A: Single child birth 
Explanation: None