The most important source for calcium and phosphorus is:

Which are not the essential constituents of a balanced diet?

Which of the following pairs is incorrectly matched?

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.

Osteomalacia is due to deficiency of

Match the following nutrition/vitamin deficiencies in Column $I$ with causes/deficiencies in Column $II$ and choose the correct option from the answer key:

Column $I$	Column $II$
$(a)$ Kwashiorkor	$(p)$ Iron
$(b)$ Anaemia	$(q)$ Menadione
$(c)$ Dermatitis	$(r)$ Protein
$(d)$ Marasmus	$(s)$ Pyridoxine
$(e)$ Bleeding	$(t)$ Biotin