Common cold is not cured by antibiotics because it is

Caused by a gram-negative bacterium

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Not an infectious disease

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Caused by a virus

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Caused by a gram-positive bacterium

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Solution

The correct option is C Caused by a virus
Viral diseases are extremely widespread infections. The most common type of viral disease is the common cold, which is caused by a viral infection of the upper respiratory tract (nose and throat). So, common cold is caused by virus and thus, can not be cured by antibiotics because antibiotics affects the cellular activities of microbes by affecting cellular structure and virus is the acellular microbe and used host metabolism for multiplication. Thus, the correct answer is option C.

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A narrow spectrum antibiotic is active against .................
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(b) gram negative bacteria only
(c) single organism or one disease
(d) both gram positive and gram negative bacteria

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