This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
A child with alopecia, hyperpigmentation psoriatic dermatitis in genitals & mouth and hypogonadism is likely to be suffering from – 
Select and explain. 
A. Cu defeciency, B. Iron deficiency, C. Zn deficiency, D. Mg deficiency
C: Zn deficiency
Answer: C: Zn deficiency 
Explanation: Features of Zinc deficiency include  :

Dwarfism (growth retardation) 
Diarrhea
Dermatitis
Hepatosplenomegaly
Iron deficiency anemia
Acrodermatitis enteropathica
Decreased immunocompetance
Poor wound healing
Hyperpigmentation
Hypogonadism
Perioral rash


Loss of hair and taste alterations may also be seen.

The patient in question presents with lzyperpigmentation, hypogonadisin, dermatitis and alopecia, all of which may be seen with Zinc deficiency.