4936
He led the National League in earned run average and won 20 games in 1937 as a rookie with Boston .
 organization: National League; organization: Boston
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:
 organization: National League; organization: Boston