What is the formula to calculate BMI?

A. $$\frac{{{{\left( {{\text{Wt}}.\,{\text{in kg}}} \right)}^2}}}{{{\text{Ht}}.\,{\text{in metre}}}}$$

B. $$\frac{{{\text{Wt}}.\,{\text{in kg}}}}{{{{\left( {{\text{Ht}}.\,{\text{in metre}}} \right)}^2}}}$$

C. $$\frac{{{{\left( {{\text{Ht}}.\,{\text{in metre}}} \right)}^2}}}{{{\text{Wt}}.\,{\text{in kg}}}}$$

D. $$\frac{{{\text{Ht}}.\,{\text{in metre}}}}{{{{\left( {{\text{Wt}}.\,{\text{in kg}}} \right)}^2}}}$$

Answer: Option B