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122. A study revealed that in a study group, intake of betacarotene decreases carcinoma of colon but it actually may be due to increased

122. A study revealed that in a study group, intake of betacarotene decreases carcinoma of colon but it actually may be due to increased intake of dietary fibre. This is due to: a. Confounding factor b. Misclassification bias c. Randomization d. Sampling error

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