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These plants are usually used as an ornamental , although they are believed to have been used as a medicinal plant by Thunberg , who wrote : " Crassula tetragona , somewhat of an stringent nature , boiled in milk , in the quantity of a handful , is used as a remedy for diarrhoea . "
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None