Given the question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Chernobyl Nuclear Power Plant sarcophagus - The Chernobyl Nuclear Power Plant sarcophagus or Shelter Object (Ukrainian: ' ) is the massive steel and concrete structure covering the nuclear reactor #4 building of the Chernobyl Nuclear Power Plant. It is designed to limit radioactive contamination of the environment following the 1986 Chernobyl disaster by encasing the most dangerous area and protecting it from climate exposure. It is located within a large restricted area known as the Chernobyl Exclusion Zone.
The answer is:
Building