You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: "FIRST" CHRONICLES 
Clue: There is reddening of the epidermis but no blistering in this

Answer: a first-degree burn


Question: Category: DESIGN 
Clue: Derived from scutum, the Latin for "shield", it's a shield bearing a coat of arms, or a metal plate around a keyhole

Answer: escutcheon


Question: Category: 50 CENT 
Clue: From 1948 to 1963 the half dollar had Ben Franklin on the front & this iconic symbol on the back

Answer:
the liberty bell