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
For early diagnosis of corynebacteria diphtheria medium used is 
Select and explain. 
A. Potassium tellurite agar, B. Loeffler's serum slope, C. Hoyle's media, D. Tinsdale
B: Loeffler's serum slope
Answer: B: Loeffler's serum slope 
Explanation: For early diagnosis - LSS (6-8hours).
For defenitive diagnosis - Potassium tellurite agar.