JAMB Physics 1980 Question 20

Which of the following statements on the use of X-rays is incorrect? X-rays are used

1. A.in hospitals to obtain photographs of tissues and bones in the body
2. B.for the treatment of malignant growths like cancer cells
3. C.in detecting fingerprints
4. D.to reveal hidden flaws in metal castings and welded joints
5. E.to detect alterations which have been made to works of art.