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

Which of the following definitions best describes the instance 'pM1a (lung)'?

A. A pathologic distant metastases stage for lung according to AJCC 7th edition indicating that metastasis is histologically confirmed and a separate tumor nodule(s) in a contralateral lobe; tumor with pleural nodules OR malignant pleural or pericardial effusion.
B. A pathologic distant metastases stage for lung according to AJCC 7th edition indicating that metastasis is based on clinical assessment and a separate tumor nodule(s) in a contralateral lobe; tumor with pleural nodules OR malignant pleural or pericardial effusion.
C. A pathologic distant metastases stage for lung according to AJCC 7th edition indicating that there is a distant metastases that is histologically confirmed and associated with distant lymph nodes or carcinomatosis.
D. A pathologic distant metastases stage for lung according to AJCC 7th edition indicating that there is a distant metastases based on clinical assessment.

Answer: A pathologic distant metastases stage for lung according to AJCC 7th edition indicating that metastasis is histologically confirmed and a separate tumor nodule(s) in a contralateral lobe; tumor with pleural nodules OR malignant pleural or pericardial effusion.