Ans has ,reason അറിയുമോ
one of ayathu kond singular verb..optionil 2 singular verb und is, has.. verb ntae 3rd form(passed)ayathu kond ans has varolu
eg: He is one of the soldiers who fight for their country. The noun after one of the is always a plural.
One of my friends is singular. And hence has. If it was some of my friends, it is plural and hence have.