2578
BACKGROUND : The involvement of water - soluble carotenoids , crocins , as the main and active components of Crocus sativus L . extract in learning and memory processes has been proposed .
 Chemical: carotenoids; Chemical: crocins
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: carotenoids; Chemical: crocins