Question: A United Nations Secretary-General selection was held in 1971 to replace U Thant, three candidates received how many votes, required in the Security Council to be selected Secretary-General, one being Kurt Waldheim, he was the fourth Secretary-General of the United Nations from 1972 to 1981, and the ninth President of Austria from 1986 to 1992?
Sentence (from "United Nations Secretary-General selection, 2016"): Six straw polls were held in the Security Council from 21 July 2016 to 5 October 2016.
Relevant evidence: No