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    				| 1. | प्रथम हृदय ध्वनि है:A. Lubb during closure of semilunar valvesB. Lubb during closure of atrio-ventricular valvesC. Dub during closure of atrio-ventricular valvesD. Dub during closure of semilunar valves | 
| Answer» Correct Answer - C | |