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: Microbiology
Positive Schick's test indicates that person is - 
Select and explain. 
A. Immune to diphtheria, B. Hypersensitive to diphtheria, C. Susceptible to diphtheria, D. Carrier of diphtheria
C: Susceptible to diphtheria
Answer: C: Susceptible to diphtheria 
Explanation: Positive test means that person is susceptible to diphtheria: So immunization is required.
Shick Test

Ref: Apurba Sastry’s Essentials of Medical Microbiology 1/e p248, Ananthanarayan 9/e p 241