By Siddhant Mishra The Bank Nifty closed at a record high of 43,596.85, up 498.15 points, or 1.16%, on Thursday, on a day the Nifty50 ended its four-session losing run and rose 48.85 points, or 0.26%, to 18,609.35. The Sensex climbed 160 points, or 0.26%, to 62,570.68, also spurred by…