Meaning of "shark eat shark"

[Sergio Bernal]

English Language Tests, Intermediate level

ESL/EFL Test #201 "Idioms about Animals", question 7

Hollywood is so competitive that it seems like a ......... world, doesn't it?

(a) shark eat shark
(b) wolf eat wolf
(c) dog eat dog

English Language Tests, Intermediate level

ESL/EFL Test #201 "Idioms about Animals", answer 7

Hollywood is so competitive that it seems like a dog eat dog world, doesn't it?

Correct answer: (c) dog eat dog
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what does mean shark eat shark?

Sergio Bernal

[Mister Micawber]

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Nothing; it is just a phrase to distract you from the correct idiom, dog-eat-dog.
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Native English teacher at Mister Micawber's