38. Which of the following exonuclease activities is present in DNA polymerase I?
(A) 3'exonuclease that degrades double stranded DNA
(B) 3'exonuclease that degrades hairpin DNA
(C) 5'exonuclease that degrades single stranded DNA
(D) 5'exonuclease that removes RNA from a DNA-RNA duplex