14127
Although the toxic potential of an excess of formaldehyde has been studied , little is known on the molecular mechanisms underlying its neurotoxicity as well as on the ability of neurons to metabolize formaldehyde .
 Chemical: formaldehyde; Chemical: formaldehyde
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: formaldehyde, formaldehyde 
Answer:
 Chemical: formaldehyde; Chemical: formaldehyde