Final answer:
The correct answer is 'cool, clammy skin,' as this is NOT a common sign or symptom of diabetic coma, whereas warm, dry skin is a symptom associated with diabetic ketoacidosis.
Step-by-step explanation:
The question asks which of the listed items is NOT a common sign or symptom of diabetic coma. Diabetic coma can occur in severe cases of ketoacidosis and is potentially fatal. Typical symptoms of diabetic coma can include deep, rapid breathing, acetone breath odor, and other symptoms such as dry skin and mouth, flushed face, nausea, vomiting, and stomach pain. However, cool, clammy skin is typically not associated with diabetic coma and is therefore the answer to the question. Instead, warm, dry skin is a symptom of diabetic ketoacidosis which can lead to coma if not treated properly.