This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
Most common cause of cervical insufficiency is 
Select and explain. 
A. Idiopathic, B. Previous dilatation, C. Exposure to DES, D. Conization
A: Idiopathic
Answer: A: Idiopathic 
Explanation: The most common cause of cervical insufficiency is idiopathicCervical incompetence may be congenital due to the following:Mullerian anomaliesCollagen disordersExposure to DES or the causes may be acquiredObstetric trauma like cervical laceration during deliveryMechanical dilatationCervical Conization