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: Medicine
Phrygian cap in gallbladder refers to: 
Select and explain. 
A. A septum (or fold) separates the fundus from the body of gallbladder, B. Agenesis of the gallbladder fundus, C. Oversized giant gallbladder, D. Duplication of the gallbladder
A: A septum (or fold) separates the fundus from the body of gallbladder
Answer: A: A septum (or fold) separates the fundus from the body of gallbladder 
Explanation: Phrygian cap is a clinically innocuous entity in which a paial or complete septum (or fold) separates the fundus from the body of the gallbladder. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 2616