This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc. (W.B.C), Subject name: Pathology
Host receptor for streptococcus pyogenes is? 
Select and explain. 
A. CD4, B. CD21, C. CD44, D. CD46
D: CD46
Answer: D: CD46 
Explanation: Ans. (d) CD46(Ref: Wintrobes I2th/pg 2523)CD46 (Complement Membrane Cofactor Protein): It is a receptor to a number of pathogens, such as herpes virus 6, M protein of group A streptococci, Neisseria gonorrhoeae, and Escherichia coli.