Which group of three of the following five statements $(I-V)$ contains is correct regarding beriberi?

$I.$ A crippling disease prevalent among the native population of sub-Sahara Africa.

$II.$ A deficiency disease caused by lack of thiamine (vitamin- $B_{1}$ ).

$III.$ A nutritional disorder in infants and young children when the diet is persistantly deficient in essential protein.

$IV.$ Occurs in those countries where the staple diet is polished rice.

$V.$ The symptoms are pain from neuritis, paralysis, muscle wasting, progressive oedema, mental deterioration and finally heart failure.