The best title for the text may be ______. Which of the following is true according to the text?

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问题 The best title for the text may be ______.
Which of the following is true according to the text?

选项 A、Saving the majority would necessarily justify the death of the minority.
B、The immune system can be trained to fight weaker versions of a disease.
C、Mandatory vaccinations are indispensable to the survival of the populace.
D、The process of vaccination remains a mystery to be further resolved.

答案B

解析
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