Final answer:
Women who have had a unilateral mastectomy have a decreased risk of breast cancer as the procedure removes one breast to treat or prevent cancer, although it does not eliminate the risk entirely.
Step-by-step explanation:
The true statement regarding women who have undergone a unilateral mastectomy is: c) Decreased risk of breast cancer. A unilateral mastectomy involves the removal of one breast and is typically performed to treat or prevent breast cancer. While this surgery cannot eliminate the risk entirely, as cancer can still develop in the remaining breast tissue or other areas of the body, it does decrease the overall risk compared to if the breast had not been removed.
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