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

Which of the following classes does 'pT1 (colon)' belong to as one valid explicit type? Context: A pathologic primary tumor stage for colon and rectum according to AJCC 7th edition indicating that the tumor invades submucosa.

A. pathologic primary tumor stage for colon and rectum according to AJCC 7th edition
B. pathologic lymph node stage for lung according to AJCC 7th edition
C. pathologic primary tumor stage for lung according to AJCC 7th edition
D. pathologic distant metastases stage for lung according to AJCC 7th edition

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