Rickets and Kwashiorkor are

Rickets is defective mineralization or calcification of bones before epiphyseal closure in immature mammals due to deficiency or impaired metabolism of vitamin D. Kwashiorkor is a condition resulting from inadequate protein intake. Early symptoms include fatigue, irritability, and lethargy. Kwashiorkor is a form of malnutrition that most often affects children in developing regions of the world

So, the correct answer is 'Deficiency diseases'