Funny IQ question - Count the Days

Oru Varudathil, 7 Masamgal 31 naatgalai kondulladhu, adhe pol ethanai maadhangal 28 naatgalai kondulladhu?.....
a) 3
b) 1
c) 12
d) 6
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You are wrong, If your ans is b.... :P 

Ans: c) 12  ella maasamum 28 naatgalai kondulladhu....THINK..