New Delhi, May 13 (ANI): Prime Minister Manmohan Singh was given a standing ovation by his staff at the Prime Minister's Office in South Block on Tuesday during a farewell they hosted for him. Around 110 staff of the Prime Minister's Office (PMO) gathered at South Block to give a farewell to Singh, who is to step down on May 17 after a decade at the top position of the country. The event also witnessed some moist eyes. Singh also thanked his staff for all their service. Some of the staff who has interacted with the prime minister during the 10 years of UPA government were seen wiping away their tears, official said.