What is meant by \'Organ culture\' ?

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