Diphtheria is due to toxin released by

Dead bacteria

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Living bacteria

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Virus

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Immune cells

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Solution

The correct option is D Living bacteria
Diphtheria is an infection caused by the bacterium Corynebacterium diphtheriae which majorly affects the throat. Symptoms include a sore throat, fever, barking cough, a grey or white patches develop in the throat. Corynebacterium diphtheriae produces exotoxins which cause necrosis of epithelial cells and forms greyish-white pseudomembrane. This membrane bleeds and leads to swelling and inflammation of the throat.
So, the correct answer is 'Living bacteria'.

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