Answer :
the organ is made up to one or more types of tissues, the organism is an individual made up of one cell (unicellular) or organ system (multicellular). it must be an organ.
The group of different tissues form organ.
So, option A is correct option.
What is an organ?
The group of cells having similar structure and perform specific function together is called tissues and a group of tissues performing particular function is called organ.
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