Answer:
The correct answer is - placebo-controlled.
Explanation:
A placebo-controlled group is a group of individual that receives an inactive medicine or substance, placebo, to prove research while other groups get real medication or medical therapy.
Placebo-controlled studies are related to test medical therapy. It is developed especially to have no effect and just to create a placebo effect.
Thus, the correct answer is - the placebo-controlled.
I think the answer is A: defining the problem and proposing a solution.
When talking about interpretting emotions it depends on how well you know the person. If they a "day-one negroid" then you could interpet all emotions. assuming your not fake. However if thy just sus negroid happiness would be the easiest. just look for a smile:) hope this helps!!! have a gr8 day.
The time your face will be numb will determine how much medicine they use to numb