"It requires hot and humid climate with temperatures ranging between 15°C and 28 °C and rainfall from 150 to 250 cm. Frost, snowfall, high temperature above 30°C and strong sun shine is not good for crop and is generally grown under shady trees. Stagnant water is harmful and the crop is grown on hill slopes at elevations from 600 to 1,600 metres above sea level." Which one of the following is that crop?