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
Which of the following doesn't present with bleeding per rectum? 
Select and explain. 
A. Ca rectum, B. Sigmoid volvulus, C. Inflammation of Meckel's diveiculum, D. Enteric fever
B: Sigmoid volvulus
Answer: B: Sigmoid volvulus 
Explanation: Sigmoid volvulus presents with features of lower intestinal obstruction not bleeding per rectum. Volvulus refers to torsion of a segment of the alimentary tract, which often leads to bowel obstruction. The most common sites of volvulus are the sigmoid colon and cecum.