What is the meaning of 'to-go specialist'?

[Liman]

Business Idiom in English, Intermediate level

ESL/EFL Test #112 "Placing an order via phone", question 10

To-go specialist: What can I ......... for you today sir?

(a) get
(b) buy
(c) make
(d) order

Business Idiom in English, Intermediate level

ESL/EFL Test #112 "Placing an order via phone", answer 10

To-go specialist: What can I get for you today sir?

Correct answer: (a) get

Your answer was: incorrect
To-go specialist: What can I buy for you today sir?
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what is the meaning of 'to-go specialist'?

Liman

[Mister Micawber]

.
It seems to mean a counter clerk in a fast food restaurant.
.
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Native English teacher at Mister Micawber's