KARACHI: President Dr Arif Alvi said Monday he was unaware of who was responsible for Pakistan's severe wheat crisis, which has sent prices flying through the roof as fears of a looming shortage hit local markets.When a reporter asked Dr Alvi in Karachi as to who was behind the wheat shortage, he said: "I don't know who's responsible for it but I should know who was it." The President was visiting a new medical facility in the metropolis. "When claims about the improving state of affairs were made, we did not know about the Treasury's situation," he added.--