Verbal Reasoning :: Analogy
6. ENFRANCHISE : SLAVERY
Enfranchise is to set free/liberate, and slavery is the opposite-i.e. to enslave/confine. Both sets are antonyms. Equation is part of mathematics (A). Bondage and subjugation (C) are synonyms (for each other and slavery). Appeasement and unreasonable (D) are unrelated. Anatomy and physiology (E) are related subjects.