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Thompson corresponded extensively on all aspects of natural history with naturalists in both Britain and Ireland, including with zoologist Thomas Bell who was at the heart of the English scientific establishment. As Thompson's reputation spread, information was passed to him by interested observers all over Ireland. However his health became poor around 1847 or 1848, when he was 42, and he suffered from heart trouble from 1847. In 1852 Thompson died of a heart attack in London where he had been tended by his friends William Thompson Yarrell, author of British Birds, Edward Forbes, Edwin Lankester, of the Ray Society and George Busk. A planned fourth volume of his The Natural History of Ireland, focusing on invertebrates and non-avian vertebrates was left incomplete on his death. He died unmarried.
 place of death: William Thompson, London
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: place of death, place of birth, education degree, education institution 
Text: {0} 
Answer:
 place of death: William Thompson, London