U.S. industrial output posted its biggest drop in more than 2-1/2 years in March in part as oil and gas well drilling plummeted, highlighting the negative impact of lower crude prices and a strong dollar on the economy. The dour report from the Federal Reserve on Wednesday was the latest sign that growth slowed sharply in the first quarter and suggested the U.S. central bank could delay raising interest rates until later this year. The absence of a lift in the other forward-looking indicators suggests that the U.S.