The correct answer is E. Microsporum canis
Correct Answer Explanation
The question stem describes a case of fluorescent tinea capitis, which is most often due to infection with M. canis.
Incorrect Answer Explanation
T. tonsurans is the most common cause of tinea capitis in North America, however, this is an endothrix infection and thus does not demonstrate fluorescence with Wood’s light examination. T. rubrum and M. nanum rarely produce non-fluorescent ectothrix tinea capitis. Candida albicans does not cause tinea capitis.