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Bloodletting was a common practice in ancient times. The doctors used to treat patients \[\underline{\mathbf{Q26}}\] the help of leeches. It was generally believed that certain diseases \[\underline{\mathbf{Q27}}\] by too much of blood or by impure blood getting blocked in some parts of the body. The doctors \[\underline{\mathbf{Q28}}\] make a slit on the body or attach leeches there. The leeches sucked the blood \[\underline{\mathbf{Q29}}\] prevented it from clotting.

A)  and       

B)         but      

C)  or          

D)         while