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
Measles vaccine contains the following as a preservative: 
Select and explain. 
A. Streptomycin, B. Cholramphenicol, C. Neomycin, D. Thiomersal
C: Neomycin
Answer: C: Neomycin 
Explanation: Measles vaccines contain sorbital and hydrolysed gelatine as stabilizer, as well as small amount of neomycin as preservative but not Thiomersal. Ref: Park's textbook of Preventive and Social Medicine, 21st edition, page-138