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: Gynaecology & Obstetrics
Mcdonald stitch is applied in the following conditions except: 
Select and explain. 
A. Incompetent os, B. Septate uterus, C. Placenta previa, D. Bad obstetrical history
C: Placenta previa
Answer: C: Placenta previa 
Explanation: Contraindications to Circlage operation:

Intra uterine infection
Ruptured membranes
H/o vaginal bleeding
Severe uterine irritability
Cervical dilatation > 4 cm