Pre-earnings action in McKesson (MCK) led by buyers of Feb 75 calls. The top trade is 3,480 at $1.75 when the market was $1.30 to $1.45. 6,113 now traded vs. 819 in open interest. Feb 72.5 puts are seeing some interest as well. 1,202 traded. Implied volatility is up 12.5 percent to 26.5 percent ahead of the results, after the close of trading today. Shares jumped 5.6 percent when earnings were last reported on 10/27.