It is truth, but you are explicitly saying those words so that the hearer (the patient) forms a false belief about the world. So it cannot be really truthful because most people in that situation would, after hearing example 3, believe that they are being given something that has more affect than a placebo.
It is truth, but you are explicitly saying those words so that the hearer (the patient) forms a false belief about the world. So it cannot be really truthful because most people in that situation would, after hearing example 3, believe that they are being given something that has more affect than a placebo.