Does a person in need of an organ transplant have a moral right to obtain that transplant, supposing the availability of the needed organ?

Does a person in need of an organ transplant have a moral right to obtain that transplant, supposing the availability of the needed organ?
How should we choose who gets a transplant, supposing that there are not enough organs for all who need them?
Which ethical theory supports not giving organ transplants at all? Why?

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