853
The extent of silver - stained CA3 and CA1 hippocampal neurons was evaluated 2 days after SE .
 Chemical: silver; Disease: SE
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: silver, SE 
Answer:
 Chemical: silver; Disease: SE