Task: Instance Description Understanding (ontology: Sciences/Computer_Science)

Which of the following definitions best describes the instance 'pT0 (ovary)'?

A. A pathologic primary tumor stage for ovary according to AJCC 7th edition indicating that the tumor has macroscopic peritoneal, metastatasis beyond pelvis, 2 cm or less in greatest dimension.
B. A pathologic primary tumor stage for ovary according to AJCC 7th edition indicating that the tumor has extension and/or implants on uterus and/or tube(s) and no malignant cells in ascites or peritoneal washings.
C. A pathologic primary tumor stage for ovary according to AJCC 7th edition indicating that there is no evidence of primary tumor.
D. A pathologic primary tumor stage for ovary according to AJCC 7th edition indicating that the tumor is limited to one ovary; capsule intact, no tumor on ovarian surface and no malignant cells in ascites or peritoneal washings.

Answer: A pathologic primary tumor stage for ovary according to AJCC 7th edition indicating that there is no evidence of primary tumor.