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

Which of the following definitions best describes the instance 'pT1a (kidney)'?

A. A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that the tumor extends into major veins or perinephric tissues but not into the ipsilateral adrenal gland and not beyond the Gerota fascia.
B. A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that the tumor is more than 4 cm but not more than 7 cm.
C. A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that the tumor grossly extends into vena cava below diaphragm.
D. A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that the tumor is 4 cm or less.

Answer: A pathologic primary tumor stage for kidney according to AJCC 7th edition indicating that the tumor is 4 cm or less.