Senior BJP leader Ravi Shankar Prasad on Monday said Rahul Gandhi must respond to the charge made by former Congress veteran Ghulam Nabi Azad that he meets “undesirable businessmen” during foreign tours. ”Ghulam Nabi Azad has made a serious allegation that whenever Rahul Gandhi goes on a foreign tour, he meets many ‘unwanted businessmen’,” Prasad told reporters here.