a computer monitor vs a computer pattern

[Janusch]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #669 "Vocabulary Practice: Computer and Accessories (1)", question 1

Similar to a television display or screen, a computer ......... is what a person looks at and sees when he/she uses a computer.

(a) pattern
(b) mouse
(c) button
(d) monitor

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #669 "Vocabulary Practice: Computer and Accessories (1)", answer 1

Similar to a television display or screen, a computer monitor is what a person looks at and sees when he/she uses a computer.

Correct answer: (d) monitor

Your answer was: incorrect
Similar to a television display or screen, a computer pattern is what a person looks at and sees when he/she uses a computer.
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why do we put here pattern? please answer me because iam confused.

Janusch

[Mister Micawber]

We don't. the correct answer is 'monitor', but you evidently answered 'pattern' (see above).
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Native English teacher at Mister Micawber's