MCQOPTIONS
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				| 1. | 
                                    Most valuable investigation for preoperative evaluation of extensive corrosive stricture is | 
                            
| A. | Endoscopic ultrasound | 
| B. | Barium study | 
| C. | CT Thorax | 
| D. | Pharyngoscopy | 
| Answer» B. Barium study | |