A child is affected by strabismus-type "lazy eye", a condition where the muscles of one eye fail to correctly position it and causes a lack of coordination between both eyes. The child's particular strabismus causes one eye to constantly look directly upward. Which extrinsic eye muscle has been weakened in this case?
A. Inferior oblique
B. Lateral rectus
C. Superior rectus
D. Inferior rectus
Answer: D
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