MCQOPTIONS
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				| 1. | 
                                    The idea of selective toxicity was first proposed by | 
                            
| A. | Paul Ehrlich | 
| B. | Antony van Leeuwenhoek | 
| C. | Alexander Fleming | 
| D. | Louis Pasteur | 
| Answer» B. Antony van Leeuwenhoek | |