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

Which of the following definitions best describes the instance 'nanomole'?

A. An International Federation of Gynecology and Obstetrics cervical cancer stage value specification indicating cervical carcinoma invades beyond the uterus, but not to the pelvic wall or to the lower third of the vagina with obvious parametrial invasion.
B. A substance unit equal to a millionth of a mol or 10^[-6] mol.
C. A substance unit equal to 10^[-12] mol.
D. A substance unit equal to one thousandth of one millionth of a mole or 10^[-9] mol.

Answer: A substance unit equal to one thousandth of one millionth of a mole or 10^[-9] mol.