Assertion: In the pressure-temperature phase diagram of water, the slope of the melting curve is found to be negative.Reason: Ice contracts on melting to water.

• A. Both assertion and reason are true and the reason is the correct explanation of the assertion
• B. Both assertion and reason are true but the reason is not a correct explanation of the assertion
• C. Assertion it true but the reason is false
• D. Both assertion and reason are false