Answer and Explanation 2

2.  A is the correct answer.  CA 19-9 is a tumor marker for pancreatic cancer.  It is also used for gall bladder cancer, bile duct cancer and gastric cancer.  CA-125 is used in ovarian cancer.  Alpha Fetal Protein (AFP) is used in liver and germ cell cancers.  CA 15-3 is in breast cancer.