मनुष्य में रुधिर वर्ग होते – McqOptions

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1.	मनुष्य में रुधिर वर्ग होते हैं, इसका पता किस वैज्ञानिक ने लगाया -
A.	कार्ल लैन्डस्टीनर
B.	यूजीन डुबॉय
C.	स्टेन्ले मिलर
D.	मेन्डल
Answer» B. यूजीन डुबॉय

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