Many a times we read in the newspapers about the Dollar rates of Gold & Silver expressed as dollar per ounce. Which among the following is a correct expression of International Troy Ounce in grams?

[A] 1 oz = 30 gms
[B] 1 oz = 31.100 gms
[C] 1 oz = 28.300 gms
[D] 1 oz = 38.300 gms

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