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
On Contrast radiography which among thefollowing is false? 
Select and explain. 
A. >Ileum is featureless, B. >Colon has haustrations, C. >Jejunum is feathery, D. Distal pa of duodenum has a cap
D: Distal pa of duodenum has a cap
Answer: D: Distal pa of duodenum has a cap 
Explanation: Distal pa of duodenum has a capThe first pa of the duodenum has the duodenal cap or bulb and not the distal pa.The first pa of the duodenum is visible as a triangular shadow on barium studies and is k/a duodenal cap.The small intestine contains mucosal folds known as plicae circulares or valvulae conniventes that are visible on barium studies and help in the distinction between small intestine and colon. Colon instead can be identified by presence of haustrations.Valvulae conniventes are more prominent in the jejunum giving the 'feathery appearance' on barium. These mucosal folds are gradually reduced distally giving a 'featureless' appearance of distal ileum.