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To weaken the pediatricians' conclusion that birds are more likely to bite children under age 13 than people of any other age group, we need to find evidence that suggests other age groups might also be at a significant risk of bird bites. Let's evaluate each answer choice:

(A) More than half of bird bites not requiring medical attention, which exceed the number requiring such attention, involve people aged 13 and older.
- This weakens the conclusion because it indicates that there are a significant number of bird bites involving people aged 13 and older, even though they don't require medical attention.

(B) The majority of bird bites resulting in the death of the bitten person involve people aged 65 and older.
- This information is not relevant to the conclusion that children under age 13 are more likely to be bitten by birds. It deals with the severity of consequences but doesn't address the likelihood of bites.

(C) Many serious bird bites affecting children under age 13 are inflicted by birds other than cockatiels and parakeets.
- This weakens the conclusion because it suggests that the type of bird might not be the primary factor in bird bites affecting children under age 13. Other birds might also pose a significant risk.

(D) Most bird bites in children under age 13 that require medical attention are far less serious than they initially appear.
- This does not necessarily weaken the conclusion but instead relates to the seriousness of the bites. It doesn't provide evidence regarding the likelihood of bird bites among different age groups.

(E) Most parents can learn to treat bird bites effectively if they avail themselves of a small amount of medical information.
- This does not address the likelihood of bird bites among different age groups and is more about treating bird bites.

Option (A) weakens the conclusion most effectively because it suggests that a significant number of bird bites involve people aged 13 and older, even if they don't require medical attention, thus casting doubt on the pediatricians' conclusion.
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