The effect of a placebo varies according to people's expectancies and previous learning, but in general, that response rate is

35%.                  

Explanation:

Placebo effect: In psychology, the placebo effect is defined as a particular phenomenon whereby a few people tend to experience a benefit or gain after the application of sham treatment or an inactive substance. The substance involved in the placebo causes no medical effects, for example, saline water, sugar pills, etc.

The placebo effect is based on the positive thinking pattern of an individual who believes in the treatment procedure is going to work.

The given statement's answer would be 35%.

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.