Meaning of 'one track mind'

[sandra]

Test No. incompl/inter-40 "Do you mind?", question 7

He has a one ......... mind as all he ever talks about is money, money, money.

(a) track
(b) road
(c) path
(d) rail

Test No. incompl/inter-40 "Do you mind?", answer 7

He has a one track mind as all he ever talks about is money, money, money.

Correct answer: (a) track

Your answer was: correct
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Could you please explain what's the meaning of one track mind?thanks!

[Alan]

This means only interested in one particular thing/topic.
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English as a Second Language
You can read my ESL story Present Simple