নিম্নের কোনটি অসত্য?

$\mathrm{NH}_{4}^{+} \text {is the conjugate acid of base } \mathrm{NH}_{3}$

$\mathrm{NH}_{3} \text { and } \mathrm{H}_{2} \mathrm{O} \text { are conjugate pair }$

$\mathrm{OH}^{-} \text {is the conjugate base of acid } \mathrm{H}_{2} \mathrm{O}$

$\mathrm{OH}^{-} \text {and } \mathrm{H}_{2} \mathrm{O} \text { are conjugate pair }$