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A cam follower , also known as a track follower , is a specialized type of roller or needle bearing designed to follow cam s. Cam followers come in a vast array of different configurations , however the most defining characteristic is how the cam follower mounts to its mating part ; stud style cam followers use a stud while the yoke style has a hole through the middle .
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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:  
Answer:
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