4740
the halogen combines with the tungsten evaporated from the hot filament to form a compound that is attracted back to the filament , thus extending the filament 's life .
 entity origin: tungsten, filament
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
 Entity Pairs:  tungsten, filament 
Answer:
 entity origin: tungsten, filament