Murali: You are wrong to assert that the question of the painting' s authenticity is a factual matter  You may believe that the painting is authentic, but this is an opinion and not a fact  Experts disagree about whether or not the painting is authentic  Prakash: Whether a painting is beautiful or not is merely a matter of opinion, but the question of who painted it is not  A painting is either authentic or not
Thus the authenticity of the painting is a factual matter
It is the conclusion of Prakash's argument.