Which group of three of the following five statements (a-e) contain is all the three correct statements regarding beri-beri - <br>(a) A crippling disease prevalent among the native population of sub-Saharan Africa <br> (b) A deficiency disease caused by lack of thiamine (vitamin $B_1$) <br> (c) A nutritional disorder in infants and young children when the diet is persistently deficient in essential protein <br> (d) Occurs in those countries where the staple diet is polished rice <br> (e) The symptoms are pain from neuritis, paralysis, muscle wasting, progressive oedema, mental deterioration and finally heart failure
