Heavy metals are _.\nOptions:\n- (A) emissions\n- (B) dangerous\n- (C) bent\n- (D) homogenous\n- (E) antigens\n- (F) vehicles\n- (G) fossil fuels\n- (H) heat energy
Please answer the following question by reasoning step-by-step.
(E)
Antigens are molecules that the immune system recognizes as foreign to the body.

Heavy metals are, in general, foreign to the body.

Heavy metals are antigens.

.

Final answer: (E)