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.

Let me give you an example: I have serious allergy in my left eye.
The answer to this example can be: eye
Here is why: Eye is an organ which has been affected, hence should be tagged.

OK. solve this:
 These results would suggest that 6 - NO ( 2 ) - 7 - OHC and 7 , 8 - OHC might have a therapeutic role to play in the treatment of renal cell carcinoma .
Answer:
renal