मानव आहार में आयरन की कमी से मुख्य रूप से निम्नलिखित में से कौन सा रोग होता है?

The characteristic softening of the entire thickness of part or, more often, the whole cornea, leading to perforation and iris prolapse is known as:

Goitre is caused by the deficiency of which of the following nutrients/elements?

Morphologically, iron deficiency anemia is characterized as: