What is the function of polynucleotide kinase?

What is the function of polynucleotide kinase? Correct Answer Addition of γ – phosphate at 5’ – OH

The enzyme polynucleotide kinase is known to add γ – phosphate at 5’ – OH end of the DNA strand. This reaction occurs at the cost of an ATP molecule which id hydrolyzed to extract energy and a phosphate.
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Polynucleotide kinase
Of all the receptors in Receptor Tyrosine Kinase family, the tyrosine kinase domain is the most strongly conserved sequence.
Serine kinase receptor has several features in common with tyrosine kinase receptor.
It is composed of two polynucleotide chains which are coiled around each other in the form of a double helix.
DNA is a polynucleotide.