A, bought a house from B, which had a leaking roof. The sale of the house was done during the winter and not in the rain season. On inspection, As contractor found that the walls were painted, in order to conceal the fact that the roof was leaking. A discusses with B, and B acknowledges that he knew about this and that he chose not to inform A of the fact that the roof had a leak Which principal in law is applicable in this instance? Further to the first answer, can A claim damages from B? are any there exceptions to this rule, list the exceptions.