text: <unk> a (new growth in Greek) is the abnormal proliferation of cells, resulting in a<unk> .  <unk> a is the scientific term for the group of diseases commonly called tumor or cancer. 
  Because<unk> a includes very different diseases, it is difficult to find a definition that describe them all. The definition of the British oncologist R.A. Willis is widely cited:
  A<unk>  is an abnormal mass of tissue, the growth of which exceeds and is uncoordinated with that of the normal tissues, and persists in the same excessive manner after cessation of the stimulus which evoked the change.
option_0: Neoplasm
option_1: Cancer Cell
option_2: Biomedical tissue
option_3: Calculus 
option_4: Biological pigment
option_5: Tissue 
option_6: Contractility
option_7: Thrombosis