21294
Suicide Most fatalities on the network are suicide s. Most platforms at deep tube stations have pits beneath the track , originally constructed to aid drainage of water from the platforms , but they also help prevent death or serious injury when a passenger falls or jumps in front of a train and aid access to the unfortunate person .
 None
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:
 None