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: Anatomy
Epiploic foramen provides communication between greater and lesser sacs. The length of the epiploic foramen is: 
Select and explain. 
A. 5 cm, B. 6 cm, C. 4 cm, D. 3 cm
D: 3 cm
Answer: D: 3 cm 
Explanation: The greater and lesser sacs communicate with each other through the epiploic foramen (of Winslow). The foramen is about 3 cm in size and situated opposite the 12th thoracic veebra. Ref: Moon D.A., Foreman K.B., Albeine K.H. (2011). Chapter 8. Serous Membranes of the Abdominal Cavity. In D.A. Moon, K.B. Foreman, K.H. Albeine (Eds), The Big Picture: Gross Anatomy.