Final answer:
The correct answer is A. Redness. Thromboembolism refers to the formation of a blood clot in a vein, which can lead to serious complications if it travels to other parts of the body. While redness, swelling, and coolness can be signs of thromboembolism due to disrupted blood flow, redness is not a cardinal sign of inflammation.
Step-by-step explanation:
The correct answer is A. Redness. Thromboembolism refers to the formation of a blood clot in a vein, which can lead to serious complications if it travels to other parts of the body. While redness, swelling, and coolness can be signs of thromboembolism due to disrupted blood flow, redness is not a cardinal sign of inflammation. The cardinal signs of inflammation, as stated in the question, are redness, heat, swelling, and pain.