The main symptoms of pinworms are () A: Skin itching, rash, especially at night B: Anus, perineum ulcer, severe pain C: Anus, perineum strange itching, especially at night D: Vaginitis, lower abdominal pain

Male genitalia do not include A: Penis B: Scrotum C: Prostate gland D: Perineum

An 11-month-old baby was scalded by hot liquid on the lower limbs, buttocks, perineum and hands. What is the scald area? A: 39% B: 40% C: 41% D: 51%