TASK DEFINITION: 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.
PROBLEM: Category: "FIRST" CHRONICLES 
Clue: There is reddening of the epidermis but no blistering in this

SOLUTION: a first-degree burn

PROBLEM: Category: THE ROMAN EMPIRE 
Clue: The noble class in Roma, its name may be from the Latin for father

SOLUTION: patrician

PROBLEM: Category: ANIMAL WORDS & PHRASES 
Clue: It's the subject in an experiment, whether or not he's this South American rodent

SOLUTION:
guinea pig