Who was the first Secretary General of the UN?

Trygve Lie

The correct answer is Option 4- Trygve Lie

Trygve Lie, who served as the United Nations' first Secretary-General from 1946 to 1952, was a Norwegian lawyer and former foreign minister. He made efforts to broker a ceasefire in the India-Pakistan conflict over Kashmir, although he faced criticism for the protracted Korean War and the Soviet Union's opposition to his second term. Eventually, he resigned from his position.