What is meant by 'Organ culture' ?

• A. Maintenance alive of a whole organ, after removal from the organism by partial immersion in a nutrient fluid
• B. Introduction of a new organ in an animal body with a view to create genetic mutation in the progenies of that animal
• C. Cultivation of organs in a laboratory through the synthesis of tissues
• D. The aspects of culture in community which are mainly dedicated by the need of a specified organ of the human body