Conversation so far:
which is the largest city of punjab in terms of population
The largest city of the state is Ludhiana. Out of total population of Punjab, 37.48% people live in urban regions.
where is the state of punjab
Punjab is a state in northern India.
is punjab india's largest state
Punjab is the 20th-largest Indian state by area.

Question: what are the state's major industries
Self-contained rewrite: what are punjab's major industries