This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
Sister Joseph's nodule may indicated cancer of all the following except: 
Select and explain. 
A. Stomach, B. Large bowel, C. Rectum, D. Ovary
C: Rectum
Answer: C: Rectum 
Explanation: Sister Mary Joseph nodule Gastrointestinal malignancies gynecological malignancies Gastric cancer (MC) Colonic cancer Pancreatic cancer (mostly body and tail) Ovarian cancer Uterine cancer