Difference between 'during' and 'while'?

[snowy]

English Grammar Tests, Elementary Level

ESL/EFL Test #94 "While, during and for", question 9

......... my stay in hospital, the nurses looked after me very well.

(a) While
(b) During
(c) For

English Grammar Tests, Elementary Level

ESL/EFL Test #94 "While, during and for", answer 9

During my stay in hospital, the nurses looked after me very well.

Correct answer: (b) During

Your answer was: incorrect
While my stay in hospital, the nurses looked after me very well.
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why use "while" is wrong? please explain.
thanks
snowy

[Torsten]

'While' is followed by a clause or a participial phrase.
'During' is followed by noun.

TOEIC listening, talks: Employee announces mark-downs at several departments in a hypermarket

[Mansur]

Why is #9 is wrong I think during is correct?

Mansur

[Mister Micawber]

.
'During' requires a specific period: during February, during the summer.
.
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Native English teacher at Mister Micawber's

[Curarpikt121]

"my stay in hospital "

Why we use "my" but not "I" here?

What is the different between "my stay in hospital" and "I stay in hospital "

[Mister Micawber]

my stay in hospital-- This is not a sentence; it is a noun phrase. 'My' is an adjective, so 'stay' is a noun.

I stay in hospital for a week every year.-- 'I' is the subject of the sentence and 'stay' is the verb.
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Native English teacher at Mister Micawber's