For the following Assertion and Reason, the correct option is:

Assertion: The pH of water decreases with increase in temperature.

Reason: The dissociation of water into${\mathrm{H}}^{+}$ and ${\mathrm{OH}}^{-}$ is an endothermic reaction.

• A

  Both assertion and reason are true, But the reason is not the correct explanation for the assertion

• B

  Assertion is not true, but reason is true

• C

  Both assertion and reason are false

• D

  Both assertion and reason are true, and the reason is the correct explanation for the assertion