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
Trachoma is caused by which serotype of chlamydia trachomatis? 
Select and explain. 
A. D to K, B. A, B, C, C. L1 L2 L3, D. All of the above
B: A, B, C
Answer: B: A, B, C 
Explanation: Ans. is. 'b' i. e., A, B, C