56139
Architecturally , the station was very similar to Whetstone in that it comprised a single island platform designed by Alexander Ross which allowed the tracks to pass either side of a central platform , and was intended to facilitate future expansion of the railway .
 person: Alexander Ross
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: Alexander Ross 
Answer:
 person: Alexander Ross