​Of the following, which describes an acute disease?

A) ​Alberto was so sick from pneumonia that he had to be hospitalized.
B) ​Brian had a heart attack; he now takes medication and is doing fine.
C) ​Claudia had a minor stroke, but did not lose any mobility or speech.
D) ​Donna was treated for a breast lump, and is pronounced cancer-free.

An acute disease is a sudden onset of symptoms that typically last for a short period of time, such as pneumonia which can cause severe symptoms that require hospitalization. Option B is not acute as it describes an ongoing condition. Option C is a minor stroke which may not necessarily require immediate medical attention, making it less acute. Option D describes treatment for cancer, which is typically a chronic condition.