Information on the type of fuel used for cooking is collected as another measure of the socio-economic status of the household. The use of some cooking fuels can also have adverse health consequences. Circle the code corresponding to the answer given. Remember that this question asks about fuel for cooking, not fuel for heating or lighting. If the household uses more than one fuel for cooking, find out which type of fuel is used most often. If electricity, liquid propane gas (LPG), natural gas, or biogas is mainly used, circle '01', '02', '03', or '04', respectively, and skip to HC8. If any fuel other than the pre-coded ones is reported as being the main fuel used for cooking, circle '96' and specify the type of fuel on the line provided. Definitions of some of the types of fuel are as follows: 'Biogas' includes gases produced by fermenting manure in an enclosed pit. 'Lignite' is a derivative of coal that produces more smoke when burned but produces less heat than coal.