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
True about serology of rickets is – 
Select and explain. 
A. a, B. b, C. c, D. d
C: c
Answer: C: c 
Explanation: Rickets is a metabolic disorder of growing bone (immature skeleton) primarily caused by lack of -

i)    Vitamin D or                  ii) Calcium or                       iii)          Phosphate

The end result is defective mineralization of bone.
Depending on the cause - Rickets is classified into following types -

Clinical variants of Rickets