This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injury to the Birth Canal, Subject name: Gynaecology & Obstetrics
Incidence of scar rupture in a pregnant lady with previous LSCS is: 
Select and explain. 
A. 0.2, B. 0.5, C. 0.7, D. 0.9
B: 0.5
Answer: B: 0.5 
Explanation: Ans: B (0.5) Ref: Williams obstetrics, 23rd edition & www. caesarean, org. uk/a rticles/VBA CMM. htmlExplanation:Incidence of Scar RuptureThe most commonly quoted scar rupture for LSCS. especially by those opposed to and afraid of VB AC is 0.5%, or 1 in 200 chance. (Ref: Murray. Enkin and Chalmers, 1994)Estimated risk of scar rupture:Type of incisionIncidence of scar ruptureLow transverse0.2- 1.5%Low vertical1 - 7%T shaped4-7%Classical4-7%