Sectors to look for in Recession

what sectors of a country's economy is less adversely affected by any economic downturns?

Some of the sectors which came out at top (after a discussion on Linkedin) were Defence, Food, Pharma, Agro, Consulting and Infrastructure. However, I don't particularly agree with Infrastructure being untouched by recession...

Check some interesting discussions on the topic at

http://www.linkedin.com/answers/finance-accounting/economics/FIN_ECO/369082-19311410?browseIdx=8&sik=1238529999125&goback=.ama

http://www.linkedin.com/answers/management/business-analytics/MGM_ANA/350239-512811?searchIdx=0&sik=1227196565242&goback=.asr_1_1227196565242