Question: Determine whether the description corresponds to an observational study or an experiment. Twenty patients with Parkinsons disease are divided into two groups. One group receives

Determine whether the description corresponds to an observational study or an experiment.

Twenty patients with Parkinsons disease are divided into two groups. One group receives an experimental drug to fight palsy, the other a placebo. After one year, memory recall is measured.

Does the description correspond to an observational study or an experiment? A or B

a)Observationalstudy
b) Experiment

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