Gene therapy is a way doctors can treat a disease by inserting a healthy gene into a patient’s cells, instead of using drugs or surgery. The new version of the gene helps the patient's body fight the disease. Gene therapy is
A) considered a very safe technique.
B) still being researched and is not used on humans.
C) still being tested and is used for diseases that have no cure.
D) used frequently today to prevent many common childhood diseases
Answer is C