$$\sqrt2-\sqrt3$$​ is:

Correct option is B

Given:

The expression is $$\sqrt{2} - \sqrt{3}.$$​​

Concept Used:

An irrational number is a number that cannot be expressed as the ratio of two integers.

Solution:
Since $$\sqrt{2}$$​ and $$\sqrt{3}$$​ are both irrational numbers, their difference, $$\sqrt{2} - \sqrt{3}$$​, is also an irrational number.