Among the following, not a Pythagorean triplet is

Pythagorean triplet : If $m,n$ and $p$ are three natural numbers and $m^2+n^2=p^2$  then $(m,n,p)$ is called Pythagorean triplet .

Option ( A ) :  3, 4, 5

$3^2+4^2=5^2$

$9+16=25$

$25=25$ it is a Pythagorean triplet

Option ( B ) : 6, 8, 10

$6^2+8^2={10}^2$

$\Rightarrow 36+64=100$

$100=100$ it is a Pythagorean triplet

Option ( C ) : 8, 15, 17 

$8^2+{15}^2={17}^2$

$\Rightarrow 64+225=289$

$289=289$ it is a Pythagorean triplet

Option ( D ) : 10, 24, 25

${10}^2+{24}^2={25}^2$

$\Rightarrow 100+576=625$

$676=625$  it is not possible.

$676\ne 625$ it is not a Pythagorean triplet