Mumbai, May 14 -- Indian benchmark stock indices took a U-turn on Tuesday after a sharp run-up the previous day on the back of easing India-Pakistan tensions and a temporary truce in the US-China trade war. The bout of profit-taking, which market experts said was on expected lines, coincided with the weekly expiry of Sensex option contracts that expire every Tuesday. On Tuesday, the BSE Sensex closed 1.55% or 1,282 points down at 81,148.22, while the Nifty 50 index closed 1.39% or 346 points down at 24,578.35. The Nifty 50 lost around 37% of the gains it made on Monday, and theSensex, 41%. The BSE's market capitalization fell by Rs.1.2 trillion to touch Rs.431.27 trillion,per data from the exchange. Looking ahead, the outlook based on optio...