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

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

A. A pathologic lymph node stage for colon and rectum according to AJCC 7th edition indicating metastasis in 2-3 regional lymph nodes.
B. A pathologic lymph node stage for colon and rectum according to AJCC 7th edition indicating metastasis in 4 or more regional lymph nodes.
C. A pathologic lymph node stage for colon and rectum according to AJCC 7th edition indicating no regional lymph node metastsis.
D. A pathologic lymph node stage for colon and rectum according to AJCC 7th edition indicating metastasis in 7 or more regional lymph nodes.

Answer: A pathologic lymph node stage for colon and rectum according to AJCC 7th edition indicating no regional lymph node metastsis.