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Haemophilia and thalassemia are best classified as which type of disease?
A{'text': 'Genetic / inherited'}
B{'text': 'Communicable infection'}
C{'text': 'Nutrient deficiency'}
D{'text': 'Allergic reaction'}
Answer & Solution
Correct answer: A. {'text': 'Genetic / inherited'}
1. Diseases are grouped by their origin: communicable (pathogen), deficiency (nutrient lack), genetic (inherited) and allergic.
2. Haemophilia is an X-linked inherited bleeding disorder; thalassemia is an inherited haemoglobin disorder.
3. Both are passed in genes from parent to child — that is, they are **genetic / inherited**.
4. They aren't caused by microbes (not communicable), by nutrient lack (not deficiency) or by immune over-reaction (not allergic).
5. Hence both are **genetic / inherited** diseases.
_Source: Selina Concise ICSE Class 8 Biology Ch 8 "Diseases and First Aid", Disease categories section_
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