Article: In May 2008, Cyclone Nargis caused extensive damage in the densely populated, rice-farming delta of the Irrawaddy Division. It was the worst natural disaster in Burmese history with reports of an estimated 200,000 people dead or missing, and damage totalled to 10 billion US Dollars, and as many as 1 million left homeless. In the critical days following this disaster, Myanmar's isolationist government was accused of hindering United Nations recovery efforts. Humanitarian aid was requested but concerns about foreign military or intelligence presence in the country delayed the entry of United States military planes delivering medicine, food, and other supplies.

Question: What is the main crop of the delta of the Irrawaddy section of Burma?
rice