What is the Best Definition of an Organ

Question

What is the best definition of an organ?  
A) A single type of tissue
B) A type of glandular tissue
C) Two or more tissues working together to perform a specific task
D) Muscle tissue that has differentiated from stem cells
E) A collection of cells and interstitial fluid

Accepted Answer

An organ is a collection of two or more tissues that work together to perform a specific task, such as the heart, liver, or lungs.

Answer: E
 Another definition of an organ is a collection of cells and interstitial fluid that perform a specific function, such as the skin, which protects the body from external damage and regulates temperature.