This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
After coming head of breech will have difficulty in delivery in all of the following condition s except: 
Select and explain. 
A. Hydrocephalus, B. Placenta pre, C. Incomplete dilation of cervix, D. Extension of head
B: Placenta pre
Answer: B: Placenta pre 
Explanation: Placenta prae Defined as a placenta located paly or completely in the lower uterine segment.The bleeding is called inevitable or unavoidable haemorrhage as dilatation of internal os inevitably results in haemorrhage (refer pgno:128 Sheila textbooks of obstetrics 2 nd edition)