21663
Dr. Hartwell Carver ( 1789 – April 16 , 1875 ) was an American doctor , businessman , and an early promoter of what would become the Transcontinental Railroad .
 Hartwell Carver, American, Railroad
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hartwell Carver, American, Railroad