This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following enzymes can polymerize deoxyribonucleotides into DNA? 
Select and explain. 
A. Reverse transcriptase, B. DNA ligase, C. DNA gyrase, D. RNA polymerase III
A: Reverse transcriptase
Answer: A: Reverse transcriptase 
Explanation: Reverse transcriptase is an RNA-dependent DNA polymerase that can synthesize first a single strand and then a double- stranded DNA from a single-strand RNA template. Must know: Primase is a DNA-dependent RNA polymerase enzyme that synthesizes an RNA molecule 10 to 200 nucleotides in length that initiates or "primes" DNA synthesis. DNA ligase joins DNA fragments and DNA gyrase winds or unwinds DNA. Transfer RNA, 5SRNA, and other small RNAs are synthesized by RNA polymerase III. Ref: Molecular Biomethods Handbook, 2nd Ed Page 154.