As a result of medical advances, many people that might at once time have died as children of such infections as diphtheria, pneumonia, or rheumatic fever now live well into old age.

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সঠিক উত্তর: খ who might once have died in childhood। ব্যাখ্যা:

As a result of medical advances, many people that might at once time have died as children of such infections as diphtheria, pneumonia, or rheumatic fever now live well into old age.

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