MCQOPTIONS
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				| 1. | 
                                    Who has discovered an Earth-sized planet, HD 21749b using Transiting Exoplanet Survey Satellite? | 
                            
| A. | ISRO | 
| B. | NASA | 
| C. | SpaceX | 
| D. | JAXA | 
| Answer» C. SpaceX | |