A female teacher at a university silently helped a poor family in a remote mountainous area for 15 years. The reporter inquired about it and found that the person doing the good was one of the five teachers of the University's School of Media, A, B, C, D, and E. In the interview, the five teachers were very humble. They told reporters this way: A: B did this thing. B: I didn't do it. C did it. C: I didn't do this thing. Ding: I didn't do this thing either. A did it. E: If A does not do it, then D will not do it either. The reporter later learned that the words of only one of the above five teachers corresponded to the real situation.
Based on the above information, the person who does this good thing is C.