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: Dental
Which of the following can cause endothrix (Black dot)
 i. Trichophyton violaceum 
 ii. Trichophyton tonsurans 
 iii. Trichophyton veruccosum 
 iv. Microsporum canis 
Select and explain. 
A. i, B. i & ii, C. i, ii & iii, D. i, ii, iii & iv
B: i & ii
Answer: B: i & ii 
Explanation: Endothrix:T.tonsurans T. violaceum, 
Ectothrix: M. canis.