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: Pathology
In Duke's classification of cancer rectum, B2 denotes - 
Select and explain. 
A. Growth extends to perirectal fat, B. Regional nodes involved, C. Limited to thickness of bowel wall, D. Hepatic metastasis
C: Limited to thickness of bowel wall
Answer: C: Limited to thickness of bowel wall 
Explanation: None