Please answer the following question: You are presented with the question "Plasma cells are activated B cells that secrete what?" and the following answer choices: - heat or cold - harmful substances - Leptospirosis - bioaerosols - protein molecules - Chemical energy - major threat to health - Veins and arteries. Now knowing that plasma cells are activated B cells that secrete antibodies and antibodies are protein molecules, choose the best answer.
Answer:
protein molecules