This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antepaum Haemorrhage, Subject name: Gynaecology & Obstetrics
Which type of placenta pre is this? 
Select and explain. 
A. Type 4, B. Type 2, C. Type 1, D. Type 3
B: Type 2
Answer: B: Type 2 
Explanation: Type 2 placenta is a placenta in the lower segment but not covering the os. A posterior type 2, as shown in this figure, is an indication to do a caesarean section as the fetal head can compress the placenta against the sacrum when the head is entering the pelvis. This can cause fetal hypoxia.