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: Surgery
Annular pancreas, true is - 
Select and explain. 
A. Complete or paial rotation failure, B. Congenital, C. Normal histology, D. All
D: All
Answer: D: All 
Explanation: Answer 'a' i.e. Complete or paial rotation failure; 'b' i.e. Congential ; 'c' i.e. Normal histology Annular pancreas is a congenital anamoly resulting from failure of normal clockwise rotation of the ventral pancreas. The histology of pancreatic tissue is normal.