Introduction:
Monsoon lands are characterized by heavy rainfall during the monsoon season, which makes them suitable for the cultivation of various cash crops. Lowland cash crops refer to crops that are typically grown in the low-lying areas of these monsoon lands. In this question, we are asked to identify the crop that is not a lowland cash crop in monsoon lands.

Explanation:
To answer this question, let's analyze each option and determine whether it is a lowland cash crop in monsoon lands or not.

Sugarcane:
Sugarcane is a tall perennial grass that thrives in tropical and subtropical regions with abundant rainfall, making it a suitable crop for monsoon lands. It requires a warm and humid climate, which is provided by the monsoon season. Moreover, sugarcane is typically grown in low-lying areas, making it a lowland cash crop in monsoon lands.

Jute:
Jute is a long, soft, and shiny vegetable fiber that is primarily grown in the Indian subcontinent. It requires a hot and humid climate, with rainfall ranging from 1500 to 3000 mm annually. Jute is mostly cultivated in the low-lying areas of monsoon lands, making it a lowland cash crop.

Manila hemp:
Manila hemp, also known as abaca, is a type of banana native to the Philippines. It produces strong fibers that are used to make rope, twine, and various other products. Manila hemp requires a tropical climate with abundant rainfall, making it suitable for cultivation in monsoon lands. It is typically grown in lowland areas, making it a lowland cash crop.

Coffee:
Coffee is a tropical plant that requires a specific combination of temperature, altitude, rainfall, and soil conditions for optimal growth. While coffee is grown in some monsoon lands, it is not typically considered a lowland cash crop. Coffee plantations are often found in hilly or mountainous regions, where the altitude and cooler temperatures provide favorable conditions for coffee cultivation. Therefore, coffee is not a lowland cash crop in monsoon lands.

Conclusion:
Based on the analysis, the crop that is not a lowland cash crop in monsoon lands is coffee. Sugarcane, jute, and Manila hemp are all lowland cash crops that thrive in monsoon lands due to their adaptability to the warm and humid climate and the abundant rainfall provided by the monsoon season.