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

Which of the following classes does 'G1: Well differentiated' belong to as one valid explicit type? Context: A histologic grade according to AJCC 7th edition indicating that the tumor cells and the organization of the tumor tissue appear close to normal.

A. International Federation of Gynecology and Obstetrics cervical cancer stage value specification
B. pathologic distant metastases stage for lung according to AJCC 7th edition
C. histologic grade according to AJCC 7th edition
D. pathologic distant metastases stage for colon according to AJCC 7th edition

Answer: histologic grade according to AJCC 7th edition