context: This plant is a source of castor oil, and contains the substance ricin, a deadly poison. Jatropha is the only plant whose seeds are rich in a hydroxy fatty acid, namely ricinoleic acid. The presence of these fatty acids makes castor oil have a stable viscosity at high temperatures so that castor oil is used as a lubricant mixture.
question: What is the main function of jatropha?
answers.text: castor oil is use