21. 20 October is observed as - A.World day for War Orphans B.United Nations Day for South-South Cooperation C.World Diabetes Day D.International Day of the Air Traffic Controller
Option D Solution: The International Day of the Air Traffic Controller, celebrated on 20 October each year, marks the anniversary of IFATCA (International Federation of Air Traffic Controllers' Associations), which was founded on 20 October 1961.
