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
Malrotation presents with which of the following features: 1. Mass abdomen 2. Bleeding PR 3. Bilious vomiting 4. Hematemesis 
Select and explain. 
A. 1 & 2, B. 2 & 3, C. 1 & 3, D. 3 & 4
B: 2 & 3
Answer: B: 2 & 3 
Explanation: "Bilious vomiting is the first sign of the volvulus, and all infants with bilious vomiting must be evaluated rapidly to ensure that they do not have intestinal malrotation with volvulus. If left untreated, vascular compromise of the midgut initially causes bloody stools, but eventually results in circulatory collapse" Ref: Schwaz 9/e, Page 1428.