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

Which of the following definitions best describes the instance 'pT0 (lung)'?

A. A pathologic primary tumor stage for lung according to AJCC 7th edition indicating that the tumor is more than 2 cm but not more than 3 cm in greatest dimension.
B. A pathologic primary tumor stage for lung according to AJCC 7th edition indicating that the tumor is 3 cm or less in greatest dimension, surrounded by lung or visceral pleura without bronchoscopic evidence of invasion more proximal than the lobar bronchus (i.e., not in the main bronchus).
C. A pathologic primary tumor stage for lung according to AJCC 7th edition indicating that there is no evidence of primary tumor.
D. A pathologic primary tumor stage for lung according to AJCC 7th edition indicating that the tumor is more than 3 cm but not more than 7 cm or the tumor has any of the following features: involves main bronchus, 2 cm or more distal to the carina, invades visceral pleura, associated with atelectasis or obstructive pneumonitis that extends to the hilar region but does not involve the entire lung.

Answer: A pathologic primary tumor stage for lung according to AJCC 7th edition indicating that there is no evidence of primary tumor.