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

Which of the following definitions best describes the instance 'Stage 0 (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 greater than in Stage II and with differing characteristics from IIIA and IIIC.
C. A clinical tumor stage group according to AJCC 7th edition indicating a carcinoma in situ (or melanoma in situ for melanoma of the skin or germ cell neoplasia in situ for testicular germ cell tumors) and generally is considered to have no metastatic potential.
D. 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 IIA and IIB.

Answer: A clinical tumor stage group according to AJCC 7th edition indicating a carcinoma in situ (or melanoma in situ for melanoma of the skin or germ cell neoplasia in situ for testicular germ cell tumors) and generally is considered to have no metastatic potential.