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B
1 : 200
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C
500 :1
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D
1 : 600
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Solution
The correct option is C 1 : 600 RBCs are about 5 million / mm3 of blood and WBCs are about 7000 / mm3 of blood. Hence, the ratio of WBC : RBC would be approximately 1 : 600. Hence, option D is the correct answer.