Which among the following gas was leaked at Bhopal during the Bhopal gas tragedy at 2-3 December 1984?

Which among the following gas was leaked at Bhopal during the Bhopal gas tragedy at 2-3 December 1984?
[A]Methyl isocyanide
[B]Methyl isocyanate
[C]Methyl isochloride
[D]Methyl isochlorate
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