In this task, you are given a sentence. You are expected to write the name of the organism substances in the body mentioned in the input. Although there might be several correct answers, you need to write one of them.

Example Input:  The agonism of 5 - HT1A receptors , negatively coupled to cAMP , reduces IOP by decreasing the production of aqueous humor , like beta - receptor antagonists which , diminishing the content of cAMP at the postjunctional site , lowers the aqueous humor secretion with a consequent decrease in IOP [ 98 ] .
Example Output: humor

Example Input:  In this study a neural network ( NN ) model was designed to predict lycopene and beta - carotene concentrations in food samples , combined with a simple and fast technique , such as UV - vis spectroscopy .
Example Output: samples

Example Input:  Cerebral blood flow ( CBF ) was measured with continuous arterial spin - labeling perfusion magnetic resonance ( MR ) imaging in 14 children with sickle cell disease and seven control subjects .
Example Output:
blood