13441
The toxicity effect of silver nanoparticles ( AgNPs ) on growth and cellular viability was investigated on the aquatic plant Lemna gibba exposed over 7 d to 0 , 0 . 01 , 0 . 1 , 1 , and 10 mg / L of AgNPs .
 Chemical: silver
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: silver 
Answer:
 Chemical: silver