Cramer's lightning round: I don't think Rivian will be the next Tesla

• 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.

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Rivian: "No, I don't think [it's going to be the next Tesla]. I think that it's going to be a very unsexy truck maker. I have to tell you, Ford has to sell its stock [in Rivian]. Why don't we buy GM? I mean, [GM CEO] Mary Barra is doing a good job. If you want those vans, she's got a whole van division. I know it's a little old fashion. Let's give it a shot."

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Gilead Sciences: "I'm not a fan. I haven't been a fan. They have what I call big hat, no cattle, and I like ones that have cattle."

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AT&T: "Small hat, no cattle. There's just not much too it. I'd rather see you in Verizon, which I thought [CEO] Hans Vestberg  acquitted himself very well when he was on 'Mad Money' and told a better growth story."

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Berkshire Hathaway: "No. They are doing better quality work now than they ever have. I think the stock is just a superior, terrific buy."

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United Airlines: "I'm not recommending airline stocks right now. It's just too tough, too competitive."

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