How do you set up the experiment for group B?
If you tell the patients in a group they are a part of a study in which all groups are receiving a placebo, aren't they going to question the merits of your experiment, as it has been explained to them? What could you possibly learn from giving two arbitrarily divided groups the same sugar pills under the same circumstances?
If you look at this from the patients point of view, there is always going to be uncertainty as to whether they are recieving drugs or placebo, no matter what you tell them.
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How do you set up the experiment for group B? If you tell the patients in a group they are a part of a study in which all groups are receiving a placebo, aren't they going to question the merits of your experiment, as it has been explained to them? What could you possibly learn from giving two arbitrarily divided groups the same sugar pills under the same circumstances? If you look at this from the patients point of view, there is always going to be uncertainty as to whether they are recieving drugs or placebo, no matter what you tell them.