Oil rallies on U.S. rig count drop; dollar up seventh month

Oil prices rallied on Friday following the sharpest weekly drop in U.S. oil rig count in nearly 30 years, while the dollar index ended January with its longest run of gains since the greenback was floated in 1971. U.S. stocks finished the day down more than 1 percent as data showed U.S. economic growth slowed sharply in the fourth quarter. Major U.S. stock indexes posted losses for the week and month, with the declines driven by falling oil prices and concern about weak overseas demand. The U.S.