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Which of the following is a common sign of dehydration in infants?

  • A. Frequent urination
  • B. Sunken fontanelle
  • C. Excessive drooling
  • D. Increased appetite
Correct Answer: B

Rationale: The correct answer is B: Sunken fontanelle. Dehydration in infants can cause the fontanelle, the soft spot on the baby's head, to appear sunken. This is due to decreased fluid levels in the body. Sunken fontanelle is a common and easily identifiable sign of dehydration in infants. The other choices are incorrect because frequent urination is not typically associated with dehydration in infants, excessive drooling can be a normal part of teething, and increased appetite is not a specific sign of dehydration in infants.