1946
the outbreak was caused by the live polio virus that is used in vaccines given orally the preferred method in developing countries because it is cheaper and does n't require medical training to dispense .
 cause effect: outbreak, virus
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 cause effect: outbreak, virus