NEW YORK (TheStreet) -- Jim Cramer once again answered viewers' Twitter (TWTR) - Get Twitter, Inc. Report questions from the floor of the New York Stock Exchange Tuesday morning.

To the viewer who asked for his views on Sears (SHLD) , Cramer replied he believes the retailer has been a short squeeze story for a long time. Sears' comparable store numbers and revenue declines -- both of which he calls "hideous" -- are only part of its problems.

Airlines are taking a hit, another viewer noted, but can Delta Air Lines (DAL) - Get Delta Air Lines, Inc. Report weather the storm? Cramer warned investors off the stock. True, there are still 10 firms that are still very bullish on the airlines, but until that changes, he explained, retail investors shouldn't be.

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Cramer also talked General Electric (GE) - Get General Electric Company (GE) Report, which he believes is a safe holding and could go to $30, although he acknowledges the stock doesn't seem to be getting there fast enough for investors.

In regards to Opko Health's (OPK) - Get OPKO Health, Inc. Report acquisition of Bio-Reference (BRLI) , Cramer explained that shares of Opko aren't down on the company's fundamentals -- they're off because the company is issuing a lot of stock. He stressed that he has total faith in Opko Chairman and CEO Phillip Frost, whom he said is building a "soup-to-nuts" pharmaceutical company. That said, Cramer warned that the stock is likely to be under pressure until the deal closes.

Another viewer pitted Nike (NKE) - Get NIKE, Inc. (NKE) Report and Cleveland Cavaliers' LeBron James against Under Armour (UA) - Get Under Armour, Inc. Class C Report and Golden State Warriors' Stephen Curry in the NBA Finals, asking who stands to be the bigger winner between the sports giants. Cramer says if Curry continues to perform as poorly as he did on Sunday, investors will want to be long Nike. But, if he turns it around and starts to go inside rather than trying for (and missing) all those three-pointers, Cramer says you better get long Under Armour.

Finally, he revealed which stocks he feels are poised to benefit from the strong U.S. dollar. In his view, among the few sectors that win based on a muscular greenback is domestic health care, so buy United Health (UNH) - Get UnitedHealth Group Incorporated Report , Anthem (ANTM) - Get Anthem, Inc. ReportHumana, (HUM) - Get Humana Inc. (HUM) ReportCigna (CIG) - Get Companhia Energetica de Minas Gerais SA Sponsored ADR Pfd Report and Aetna (AET)

If you have a stock question you'd like answered by Jim Cramer, make sure to tweet it @jimcramer using #CramerQ.