I know the mole

All eyes are focussed towards Jaswant Singh as he claims of a mole in PMO ever since the 90's. The unanimous question everyone is asking is: "Who is the mole?"

Given the reputation of Jaswant Singh as a high-profile diplomat, I do expect he has something up his sleeve rather than merely embarassing the NDA. But still, it's such a simple question to answer. Who doesn't know the mole? Any self-respecting person who passed high-school without cheating would know it. Here it is:

"A mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 12 grams of carbon 12, where the carbon 12 atoms are unbound, at rest and in their ground state."

Jaswant Singh is correct. He knows the mole.