9210
His works from these years include music for string quartet ( similar in tone to Berg 's opus 3 work ) , a string trio , and a piano sonata , among others .
 person: Berg
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Berg