8696
Fluorescent 25 nm polystyrene nanospheres were chosen as nanoobjects to be dispensed because they enable both the in situ monitoring of the process by optical microscopy and the ex situ high - resolution characterization of the pattern by e . g . scanning electron microscopy .
 Chemical: polystyrene
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polystyrene