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A study in the 1980s found a link between drinking coffee and increased risk of pancreatic cancer. This study failed to consider the fact that many heavy coffee drinkers are also smokers. Smoking, and not coffee, may have been what cause the increased risk of pancreatic cancer. In this example, smoking is______.


A.
Random Variation

B.
A Confounding Variable

C.
A Placebo

D.
An Epidemic Curve

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Answer: A

Explanation:

The study of blood is called hematology. The component of blood is RBC, WBC, plasma, and platelets.

The correct answer is option A which is random variation.

What is smoking?

  • Tobacco smoking is the practice of burning tobacco and ingesting the smoke that is produced.
  • The smoke may be inhaled, as is done with cigarettes, or simply released from the mouth, as is generally done with pipes and cigars.

According to the question, the correct answer is option A because the coffee drinker is also a smoker which causes the effect on the pancreas.

Hence, the correct answer is option A.

For more information about the drug, refer to the link:-

https://brainly.com/question/16759172