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In proposing his plan for a mint and a coinage system , Secretary of the Treasury Alexander Hamilton in 1791 proposed that the one-dollar denomination be struck both as a gold coin , and as one of silver , representative of the two metals which he proposed be made legal tender .
 person: Alexander Hamilton
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Alexander Hamilton 
Answer:
 person: Alexander Hamilton