For which of the following discovery, Nobel Prize for 2015 Chemistry was awarded?

for discoveries in DNA repair
The 2015 Nobel Prize in Chemistry jointly awarded to Tomas Lindahl, Paul Modrich and Aziz Sancar for having mapped, at a molecular level, how cells repair damaged DNA and safeguard the genetic information. Tomas Lindahl is from the Francis Crick Institute, UK; Paul Modrich is from Duke University School of Medicine, USA and Aziz Sancar belongs to University of North Carolina School of Medicine, USA. Their work provided fundamental knowledge of how a living cell functions and how it is used for the development of new cancer treatments. The winners will share the 8 million Swedish kronor (about $960,000) prize money. Each winner will also get a diploma and a gold medal at the annual award ceremony on Dec. 10, the anniversary of the death of prize founder Alfred Nobel.