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: Social & Preventive Medicine
2 years old child was brought to the emergency department. He was having convulsions. On a rapid general physical examination kyphoscoliosis was discovered X-ray showed swollen lower end of radius. What is the likely diagnosis? 
Select and explain. 
A. Osteomalacia, B. Keratomalacia, C. Rickets, D. Pellagra
C: Rickets
Answer: C: Rickets 
Explanation: None