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
True regarding carcino embroyonic antigen are A/E- 
Select and explain. 
A. Is a glycoprotein, B. Helps in knowing recurrence after resection, C. Increases in Ca colon associated with only liver metastasis, D. Usually associated with malignancies of GI tract
C: Increases in Ca colon associated with only liver metastasis
Answer: C: Increases in Ca colon associated with only liver metastasis 
Explanation: Ans. is 'c' i.e., Increase in Carcinoma colon associated with only liver metastasis o Carcino embryonic antigen elevation occurs in about 70% of patients of colon carcinoma. It has got no relation with hepatic metastasis.