'quarantine' vs 'remission'

[Ilovepsycho]

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Q. Thankfully the disease has gone into ______ ; it may not recur for many years.

a. treatment

b. sequestration

c. quarantine

d. remission

e. oblivion

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'Quarantine' is a word meaning 'a period of time during which a person or animal that might have a disease is kept away from other people or animals so that the disease cannot spread' by Cambridge Dictionary, and 'remission' is a word meaning 'if the disease is in remission, the disease has been controlled so that they are not as ill as they were' by Collins Dictionary, or 'a period during which a serious illness improves for a time and the patient seems to get better' by Oxford Dictionary.

I'm confused between 'quarantine' and 'remission'. If you select one, please tell me your reasoning.

[Mister Micawber]

'Remission' is control of the disease within a single patient: after radiation treatment, a patient's cancer may go into remission. 'Quarantine' is control of the spread of a disease by isolating any patients who have contracted it: passengers thought to have swine flu were put into quarantine at a hotel in Beijing.

'Remission' is the correct answer here.
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Native English teacher at Mister Micawber's