This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant Viral Diseases in Children, Subject name: Pediatrics
A 5-year-old child develops fever with rash on the first day of fever. Rash disappears after few days & the child develops ataxia. Most probable diagnosis is: 
Select and explain. 
A. Measles, B. Fifth disease, C. Chicken pox, D. Rocky mountain spotted fever
C: Chicken pox
Answer: C: Chicken pox 
Explanation: Rash appearing on 1st day of fever suggests Chickenpox Ataxia can occur as a complication of varicella infection.