What social behavior is most typical of the school-aged child?

Choice A rationale

At 12 months, a child typically says their first single words with meaning, such as "mama" or "dada," and may understand simple commands. Reaching a vocabulary of 50 words is not expected at this early stage of language development.

Choice B rationale

By 24 months, most toddlers have experienced a significant language explosion and are typically able to say at least 50 words and are beginning to combine two words into simple phrases. This is a key milestone in language development.

Choice C rationale

At 36 months, a child's vocabulary has typically expanded significantly, often exceeding several hundred words. They are also using longer and more complex sentences. Saying only 50 words at this age would be considered a developmental delay.

Choice D rationale

At 15 months, children are typically in the stage of building their vocabulary beyond the initial single words. While some may be approaching a larger vocabulary, consistently saying 50 words is more characteristic of older toddlers closer to 24 months.

Choice A rationale

Pain is a common symptom in superficial and partial-thickness burns where nerve endings are still intact. While pain indicates tissue damage, the absence of pain in a burn area can signify deeper and more severe injury where nerve endings have been destroyed.

Choice B rationale

No pain with pale, leathery skin is a characteristic finding of a full-thickness (third-degree) burn. The destruction of nerve endings eliminates pain sensation, and the skin appears dry, leathery, and may be white, charred, or translucent due to damage to all skin layers and underlying tissue.

Choice C rationale

Mild erythema, or redness of the skin, is characteristic of a superficial (first-degree) burn, such as a sunburn. These burns involve only the epidermis and are typically painful and without blisters.

Choice D rationale

Blister formation is a hallmark of partial-thickness (second-degree) burns, which involve the epidermis and part of the dermis. These burns are typically painful and moist.