Deficiency of which vitamin causes glossitis dementia roughed keratotic areas on skin and gastrointestinal symptoms?

A 10-years-old child presents with anemia and recurrent fractures. The X-ray shows diffuse hyper density of bone The diagnosis is most likely to be________?

Adipose tissue releases free fatty acids in the________?

Chicken-wire appearance of enlarged bone marrow spaces is seen in________?

End product of purine metabolism is________?

Forensic Identification utilizes________?