Which class of antibodies is generally less efficient at activating complement but may cause extravascular hemolysis or destruction of the red blood cells outside the circulation?

Antacids are alkaline compounds used to neutralize hydrochloric acid that may contain aluminum, magnesium, sodium, potassium, or:

A) prostaglandins B) histamine C) calcium D) antibacterial agents

Which of the following statements about wearing jewelry is NOT true?

A. Jewelry tends to harbor germs. B. Rings may scratch the resident. C. Jewelry may injure the resident. D. A watch with a second hand is unnecessary.