In Africa and South-East Asia,people prefer to consume more bread and butter than pulses. Which deficiency disease are they likely to suffer from?

Which group of three of the following five statements $(I-V)$ 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 persistently 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.

Vasco de Gama $(1498)$ sailed to explore India with $180$ companions,but most of them died due to:

Which of the following pairs is not correctly matched?

The earliest known vitamin is:

People who are dependent exclusively on a maize diet are more likely to suffer from: