1987
as a geologically inactive remnant from accretionary epochs of solar system history , callisto was expected to be a dead , cratered relict , useful only as a contrast to the other , more geologically active satellites .
 entity origin: remnant, epochs
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:
 entity origin: remnant, epochs