7767
Retinaldehyde reduction can be performed by SDR and aldo - keto reductases ( AKR ) , while its oxidation to RA is carried out by aldehyde dehydrogenases ( ALDH ) .
 Chemical: Retinaldehyde; Chemical: aldehyde
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: Retinaldehyde, aldehyde 
Answer:
 Chemical: Retinaldehyde; Chemical: aldehyde