What is a southpaw?

[Dongocan]

English Language Tests, Intermediate level

ESL/EFL Test #731 "Right, Left and Straight (1)", question 10

In America, .........-handed boxers are called South Paws.

(a) right
(b) left
(c) straight

English Language Tests, Intermediate level

ESL/EFL Test #731 "Right, Left and Straight (1)", answer 10

In America, left-handed boxers are called South Paws.

Correct answer: (b) left

Your answer was: incorrect
In America, straight-handed boxers are called South Paws.
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could u tell me the meaning of"South Paw",please?
thx in advance

[Mister Micawber]

southpaw = left-handed person.
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Native English teacher at Mister Micawber's