Which of the following is an example of a genetic type of cancer?

Breast cancer is indeed an example of a genetic type of cancer. Certain types of breast cancer, particularly those associated with mutations in the BRCA1 and BRCA2 genes, demonstrate a hereditary pattern. These genetic mutations significantly increase the risk of developing breast cancer, as well as other cancers, such as ovarian cancer. The identification of these genetic risks allows for enhanced screening and preventive strategies for individuals with a family history of such malignancies.

In contrast, pneumonia, diabetes, and chronic kidney disease are not classified as cancers. Pneumonia is an infectious disease of the lungs, diabetes is a metabolic disorder related to insulin and blood sugar levels, and chronic kidney disease involves progressive loss of kidney function. While there may be genetic factors that influence susceptibility or progression to these diseases, they do not belong to the category of cancers and therefore do not fit the context of genetic cancers like breast cancer does.