Cramer's lightning round: Iron Mountain is a buy

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

STMicroelectronics: "I think that's a good semi company and that group's going higher. Micron is leading the way again."

ConocoPhillips: "Well look, I'm not a big fan of the fossil fuel stocks for a variety of reasons. You are in the one with the best growth profile, the large ones. Look, if you want to own it, it's got a 3% yield. It's O.K."

Nucor: "If you like a steel company, it's the best steel company. I don't prefer steel companies. I think there's too much competition, but if you like them they are the one."

Crown Castle: "I think you're in good shape."

Nio: "I like to do more than just dice rolling."

Tandem Diabetes: "Just 'cause a stock goes down does not mean it's a bad company. Tandem Diabetes ... is a good situation."

Iron Mountain: "I think it's a buy."

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