Detailed Instructions: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Problem:How are the farmes able to grow crops in such an unforgiving climate?, Context: Despite its tropical wet and dry climate, extensive irrigation makes it a rich agricultural region. Its canal-irrigation system established by the British is the largest in the world. Wheat and cotton are the largest crops. Other crops include rice, sugarcane, millet, corn, oilseeds, pulses, vegetables, and fruits such as kinoo. Livestock and poultry production are also important. Despite past animosities, the rural masses in Punjab's farms continue to use the Hindu calendar for planting and harvesting.
Solution:
extensive irrigation