Definition: In this task, you will be given sentences in which your task is to recognize the name of the organ of the body. An organ is a collection of tissues that structurally form a functional unit specialized to perform a particular function. Although there might be several correct answers, you need to write one of them.
Input:  The Met - enkephalin versus Leu - enkephalin concentration ratio was around five in each area of the brain assayed .
Output:
brain