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B
Odontology
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C
Gynaecology
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D
Gerontology
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Solution
The correct option is D Gerontology
Chronology is the science of arranging events in their order of occurrence in time. Odontology is the study of structure, development and abnormalities of the teeth. Gynaecology is the branch of medicine concerned with diseases in women. Whereas gerontology is the scientific study of ageing.