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In 1902 William Bayliss and Ernest Starling performed an experiment in which they observed that acid instilled into the duodenum caused the pancreas to begin secretion , even after they had removed all nervous connections between the two .
 person: William Bayliss; person: Ernest Starling
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: William Bayliss, Ernest Starling 
Answer:
 person: William Bayliss; person: Ernest Starling