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

Which of the following classes does 'pTis (colon)' belong to as one valid explicit type? Context: A pathologic primary tumor stage for colon and rectum according to AJCC 7th edition indicating carcinoma in situ (intraepithelial or invasion of lamina propria).

A. pathologic primary tumor stage for lung according to AJCC 7th edition
B. pathologic primary tumor stage for colon and rectum according to AJCC 7th edition
C. histologic grade according to the Fuhrman Nuclear Grading System
D. pathologic primary tumor stage for kidney according to AJCC 7th edition

Answer: pathologic primary tumor stage for colon and rectum according to AJCC 7th edition