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
Cholera toxin binds to which receptors in intestine: 
Select and explain. 
A. Sphingosine through A subunit, B. Sphingosine through B subunit, C. GM1 gangliosides through A subunit, D. GM1 gangliosides through B subunit
D: GM1 gangliosides through B subunit
Answer: D: GM1 gangliosides through B subunit 
Explanation: Ans. is. 'd' i. e., GM1 gangliosides through B subunit