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
Positive schick test indicates 
Select and explain. 
A. Person is susceptible to syphilis, B. Person has immunity to syphilis, C. Person is susceptible to Diphtheria, D. Person has immunity to Diphtheria
C: Person is susceptible to Diphtheria
Answer: C: Person is susceptible to Diphtheria 
Explanation: None