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.

Example Input:  When given in low doses for prolonged periods , methotrexate may have adverse effects on bone , particularly in post - menopausal women .
Example Output: bone

Example Input:  Villous cytotrophoblastic cells were isolated by sequential enzymatic digestion of chorionic villi from the first trimester , second trimester and term placenta and purified on a discontinuous percoll gradient , as described previously . 47 - 49 These cells were positively stained for cytokeratin 7 at 95 % , indicating the cytotrophoblastic origin of the cells .
Example Output: placenta

Example Input:  alpha2M promotes the protease - mediated degradation of alpha2M / Abeta complexes and contributes to clearance of Abeta from the brain ( discussed in paragraph 4 ) [ 138 , 139 ] .
Example Output:
brain