This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Microbiology
Quellung reaction is seen with: 
Select and explain. 
A. Pneumococcus, B. Gonococcus, C. Streptococcus, D. Staphylococcus
A: Pneumococcus
Answer: A: Pneumococcus 
Explanation: Quellung reaction Capsular swelling due to serological reaction Pneumococcal Capsular antigen + Antibody causes Capsular swelling Note:- MC fadyean's reaction Done for bacillus anthracis capsule (polypeptide)