81737
A February 2010 study by Barbara Block of Stanford University estimated the world population of great white sharks to be lower than 3,500 individuals , making the species more vulnerable to extinction than the tiger , whose population is in the same range .
 person: Barbara Block; organization: Stanford University; animal: tiger
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: Barbara Block, Stanford University, tiger 
Answer:
 person: Barbara Block; organization: Stanford University; animal: tiger