Cancer​

A) ​is a relatively new disease, first diagnosed during the latter half of the 19th century.
B) ​is a group of diseases marked by the growth and spread of new cells.
C) ​is due to a parasite that attacks new cells.
D) ​is due almost completely to contact with dangerous chemicals.

Cancer is a group of diseases characterized by the uncontrolled growth and spread of abnormal cells. It is not a new disease, as evidence of cancer has been found in ancient human remains. Cancer can be caused by various factors, including genetic mutations, environmental factors such as exposure to radiation or chemicals, and lifestyle factors such as smoking and poor diet. There is no evidence to support the idea that cancer is caused by a parasite attacking new cells.