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 is true of Ulcerative colitis - 
Select and explain. 
A. String sign of kantor positive, B. Skip lesions are seen, C. Rectum is always involved, D. Fistulas are common
C: Rectum is always involved
Answer: C: Rectum is always involved 
Explanation: Ans. is 'c' i.e., Rectum is always involved