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

Which of the following definitions best describes the instance 'pN1 (ovary)'?

A. A pathologic lymph node stage for ovary according to AJCC 7th edition indicating that there is no regional lymph node metastasis.
B. A mass density unit which is equal to mass of an object in grams divided by the volume in deciliters.
C. the instance is a GenePattern software module which is used to perform a principal components analysis dimensionality reduction data transformation.
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 regional lymph node metastasis.