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Am I Blue?

Doctors can grow so accustomed to hunting disease, they may overlook the possibility that sometimes symptoms aren't symptoms at all. Physician Meyer Schwartz described such a case in a letter to the Journal of the American Medical Association.
Schwartz was on duty at a clinic one morning a few days after Christmas when a man came in complaining only of "blueness to his face of one hour's duration." He reported no other symptoms, no itching, dizziness, or shortness of breath, and no history of heart disease or bleeding disorders.
It was only 10:15 A.M. and all the patient had done that day was shower, shave, and dress. So far, his hands and body were still their normal color and his face was not tender or swollen, but on both sides it was distinctly blue up to the cheekbones. Knowing that blue skin may indicate an oxygen deficiency in the blood or an adverse drug reaction, Schwartz checked the patient thoroughly. But finding nothing else out of the ordinary, he sent the blue man home.
At 5:30 the man called Schwartz to report that he had "washed his face and the blue came off." He had received blue towels for Christmas and had used them that morning for the first time.

1. Major Event of the Story ( )
A. Dr. Schwartz was on duty one day when a man came in complaining about "blueness on his face of one hour's duration".
B. Even though a man's face turned blue, when he went to see a doctor, the doctor sent him home because he found no other signs of illness.
C. Dr Schwartz knew that blue skin may indicate an oxygen deficiency, so he checked the patient thoroughly.
D. The man didn't have any symptoms such as dizziness, itching or shortness of breath.

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