Markets open lower; Sensex sheds 200 points: Markets have opened lower tracking weakness among the global peers as investors remain wary of rising bond yields coupled with weaker-than-expected US retail data. Also, caution prevails as market participants keenly await for the wholesale price inflation (WPI) data for the month of April due later in the day today. At 9.30 AM, the 30-share Sensex is down 131 points at 27,120 and the 50-share Nifty has shed 50 points at 8,185. The Indian rupee opened flat at 63.97 per dollar on Thursday against previous close of 64 per dollar. The US dollar continues to weaken, declining 1 percent yesterday. While the euro topped 1.13 to the dollar after weak US retail sales data suggests a dovish Fed.