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

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

A. A clinical tumor stage group according to AJCC 7th edition indicating cancers that are smaller or less deeply invasive without regional disease or nodes.
B. A clinical tumor stage group according to AJCC 7th edition indicating a small carcinoma, either asymptomatic or giving rise to metastases without symptoms due to the primary carcinoma.
C. 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.
D. 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 IVA.

Answer: 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 IVA.