Is it the right of people receiving health care to have the truth, the whole truth and nothing but the truth from their physicians insofar as their diagnosis, prognosis and treatment is concerned? If...

 Is it the right of people receiving health care to have the truth, the whole truth and nothing but the truth from their physicians insofar as their diagnosis, prognosis and treatment is concerned? If so, what is it based upon?  What ethical principle supports this "right"? Explain how the principle supports the "right" as a "good" thing.  If not, why not?