This is TALK OF THE NATION. I'm Neal Conan, in Washington. All of us prefer to be told the truth - at least, we say we do - even when the diagnosis is terminal. And doctors believe they have an obligation to deliver bad news except that often, they don't. In a survey of nearly 2,000 physicians by the Mongan Institute for Health Policy at Massachusetts General Hospital, a majority said they believe they should never lie to a patient and yet more than half delivered a rosier prognosis than warranted, and 10 percent outright lied.