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     EduGorilla 
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    Durga lives in a village and cooks food on a chulha (earthen stove) using wood or cow dung cakes as fuel. She has been suffering from severe cough for the last three months. This may be due to the

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    1. smoke produced by burning fuels, which may have caused her allergy
    2. old age and pollution inside and outside her hut
    3. carbon monoxide produced by burning fuel, which may have been deposited in her respiratory tract
    4. soot produced by burning the fuels, which may have been deposited in her respiratory tract
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