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In 1999 Tsao Chi - hung learned that the Water Conservancy Bureau was planning to renovate the flood defenses , and he proposed a scheme for " greenification " of the riverside area .
 date: 1999; person: Tsao Chi - hung; organization: the Water Conservancy Bureau
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 date: 1999; person: Tsao Chi - hung; organization: the Water Conservancy Bureau