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.

Q:  In vitro cytotoxic potential and mechanism of action of selected coumarins , using human renal cell lines .

A: renal
****
Q:  Image - directed and color Doppler studies of gallbladder tumors .

A: gallbladder
****
Q:  After one month ' s treatment there was striking radiological improvement apart from the persistence of the oesophageal stricture .

A:
oesophageal
****