This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Thickness of placental barrier in early pregnancy 
Select and explain. 
A. 0.5 mm, B. 0.05 mm, C. 0.025 mm, D. 0.25 mm
C: 0.025 mm
Answer: C: 0.025 mm 
Explanation: Placental barrier in early pregnancy consists of Synctiotrophoblast Cytotrophoblast Basement membrane Stromal tissue Endothelium of fetal capillary wall It is about 0.025 mm thick Ref: Dutta Obs 9e pg 30.