An antibiotic effective in treatment of pneumonia, bronchitis etc. is

Which of the following antibiotics is dffective in treatment of pneumonia, and bronchitis?

Which of the following antibiotics is dffective in treatment of pneumonia, and bronchitis?

Antibiotics are the chemicals secreted by the micro organisms which either inhibits the growth (or) destroy the pathogenic bacteria. Previously chloramycetin used to be a product of fermentation but at present synthetic method has replaced it A drug effective in the treatment of pneumonia, bronchitis etc is

A drug effective in the treatment of pneumonia, and bronchitis,is -----