Which is the best source for vitamin $B_1$?

Which disease is caused by a prolonged deficiency of nicotinic acid (Niacin/Vitamin $B_3$)?

Excess intake of food calories,especially food with little water,sugar,honey,and ghee causes:

The mine workers are most likely to suffer from which of the following conditions due to lack of sunlight exposure?

Which of the following is a mode of nutrition?

Which group of three of the following five statements $(1-5)$ contains all three correct statements regarding beri-beri?
$1.$ $A$ crippling disease prevalent among the native population of sub-Saharan Africa.
$2.$ $A$ deficiency disease caused by lack of thiamine (vitamin $B_1$).
$3.$ $A$ nutritional disorder in infants and young children when the diet is persistently deficient in essential protein.
$4.$ Occurs in those countries where the staple diet is polished rice.
$5.$ The symptoms are pain from neuritis,paralysis,muscle wasting,progressive oedema,mental deterioration,and finally heart failure.