9884
In 1912 , Luitpold was succeeded in the position of " Prinzregent " by his son Ludwig .
 person: Luitpold; person: Ludwig
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: Luitpold, Ludwig 
Answer:
 person: Luitpold; person: Ludwig