Question

A study showed that people who take a B12 vitamin daily have a significantly better chance of protecting against Alzheimer's disease than those who did not take the vitamin daily. Which of the following statements is/are correct?
I. This study provides evidence that taking a B12 vitamin daily contributes to protecting against Alzheimer's disease.
II. The general health consciousness of people who take B12 vitamins could be a confounding variable.
III. This is an observational study and not an experiment.
a. l only
b. III only
c. l and II only
d. ll and III only
e. I, II, and III

Answer 1

Answer: The answer is D, II and III only.

Answer 2

The statements that are correct include:

• II. The general health consciousness of people who take B12 vitamins could be a confounding variable.
• III. This is an observational study and not an experiment.

Alzheimer's disease is a form of dementia which lead to memory loss and can lead to a mental disorder.

Based on the information given, this is an observational study as a certain population was looked at. It also shows that taking the B12 vitamin daily contributes to protecting against Alzheimer's disease.

Therefore, the correct option is D.

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