What creates active immunity from a parasite?\nOptions:\n- (A) Cooking\n- (B) memory cells\n- (C) alpacas\n- (D) peachleaf willow\n- (E) Allergies\n- (F) mammals\n- (G) an organism's body\n- (H) animals Let's solve this problem gradually.

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Active immunity results when an immune response to a pathogen produces memory cells. If the parasite causes harm, it is a pathogen. When a parasite produces memory cells, active immunity results. So the final answer is (B).
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