 
			 
			MCQOPTIONS
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				| 1. | __________ tubes are good substitude for human blood vessels onrheart by-pass operation. | 
| A. | PVC | 
| B. | Polythene | 
| C. | Teflon/dacron | 
| D. | Polystyrene | 
| Answer» D. Polystyrene | |