What's the meaning of co?

[Harshgupta_04]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #667 "Real Life: Insurance Terms (2)", question 2

In the United States, a ......... payment is a partial payment made by a person who received medical care while covered under a group medical insurance plan.

(a) un
(b) co
(c) pre
(d) post

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #667 "Real Life: Insurance Terms (2)", answer 2

In the United States, a co payment is a partial payment made by a person who received medical care while covered under a group medical insurance plan.

Correct answer: (b) co

Your answer was: incorrect
In the United States, a pre payment is a partial payment made by a person who received medical care while covered under a group medical insurance plan.
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What's the meaning of co

[Mister Micawber]

'Co-' is a prefix meaning 'together'; it is an incorrect answer here.
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Native English teacher at Mister Micawber's

[Harshgupta_04]

Thankyou Sir