A mother presents with her 4-day-old infant, reporting severe nipple pain throughout feedings. The infant's latch appears shallow, and the nipple is misshapen, resembling the tip of a new lipstick, after feeding. Which of the following is the MOST likely cause of this mother's nipple pain?
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A
Thrush infection of the nipples
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B
An overactive milk ejection reflex
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C
Suboptimal infant positioning and latch
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D
Normal postpartum nipple tenderness