As she studies her veterinary science course, Saanvi is creating a chart to help her remember which veterinary diseases produce which symptoms. Her chart is brief because she just uses it to refresh her memory before the tests, but Saanvi hopes that when she has her own practice, these little tips will come to her mind when she needs them. When she enters ringworm on her chart, which symptom will Saanvi MOST likely put to watch out for?

A.
circular patches of hair loss

B.
skin boils with black, smelly centers

C.
bloody diarrhea or bleeding from mouth

D.
head butting or loss of coordination