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Pregnant women who are exposed to potential allergens during pregnancy tend to have children who are more resistant to common allergies. Researchers concluded that such exposure is directly linked to preventing childhood allergies and recommend deliberate exposure to women who are expecting.

Which of the following statements, if true, most weakens the researchers' conclusions?


Depending on the season, some potential allergens like pollen might not be available to women who are expecting.


Pregnant women who do not experience allergic reactions to stimuli are more likely to pass these resistances on to their offspring.


It is possible that the gene linked to allergy receptiveness is inherited by the male instead of the female parent.


Statistically, more children develop allergies to pollen and dust than to peanuts or shellfish.


Some people develop allergies with the onset of puberty.

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