Given the reaction: NH3 + H2O → NH4+ + OH-, identify the conjugate acid-base pairs.

• A. NH3/NH4+ and H2O/OH-
• B. NH3/OH- and NH4+/H2O
• C. NH4+/NH3 and OH-/H2O
• D. NH4+/OH- and NH3/H2O

Answer: (A)