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

Which of the following definitions best describes the instance 'Stage IIA (AJCC 7th)'?

A. A clinical tumor stage group according to AJCC 7th edition indicating cancers with increasing tumor or nodal extent greater than in Stage II and with differing characteristics from IIIB and IIIC.
B. A clinical tumor stage group according to AJCC 7th edition indicating cancers with increasing tumor or nodal extent but less than in Stage III and with differing characteristics from IIB and IIC.
C. A clinical tumor stage group according to AJCC 7th edition indicating cancers in patients who present with distant metastases at diagnosis and with differing characteristics from IVB.
D. A clinical tumor stage group according to AJCC 7th edition indicating cancers with increasing tumor or nodal extent greater than in Stage II and with differing characteristics from IIIA and IIIC.

Answer: A clinical tumor stage group according to AJCC 7th edition indicating cancers with increasing tumor or nodal extent but less than in Stage III and with differing characteristics from IIB and IIC.