Teaching KVS Stenographer Mock Test General Science Biology Biology in Everyday life

ভিটামিন B12 -এ কোন ধাতু রয়েছে? 

1
সোডিয়াম 
2
কোবাল্ট 
3
ম্যাগনেসিয়াম 
4
লোহা 
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