Cramer's lightning round: Dollar General is a great opportunity

• 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.

Ambarella: "It's made a nice comeback. It's video compression. I never thought that they could make the comeback and I think that you're OK in it."

Dollar General: "I think it's a great opportunity."

Quidel: "I'm going to go no on Quidel."

XPO Logistics: "You want to buy it because [CEO] Brad Jacobs is a genius. ... The doubters have been completely wrong."

Boise Cascade: "I think it's a strong buy."

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Cramer's lightning round: Dollar General is a great opportunity

Mad Money with Jim Cramer

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