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

Which of the following definitions best describes the instance 'pN0 (ovary)'?

A. A histologic grade according to AJCC 7th edition indicating that the tumor cells and the organization of the tumor tissue appear close to normal.
B. A pathologic lymph node stage for ovary according to AJCC 7th edition indicating that there is no regional lymph node metastasis.
C. A histologic grade according to AJCC 7th edition indicating that the tumor cells are moderately differentiated and reflect an intermediate grade.
D. A pathologic lymph node stage for ovary according to AJCC 7th edition indicating that there is regional lymph node metastasis.

Answer: A pathologic lymph node stage for ovary according to AJCC 7th edition indicating that there is no regional lymph node metastasis.