病例:患者,3岁,近半年来,其家属发现,该患者看到尖锐物品就痛哭不止,更不敢接触它们,害怕会用这种物品伤害别人。像该患者这样的疾病,平均起病年龄为()
A.22.7岁
B.30.8岁
C.15.6岁
D.4.4岁
正确答案是D
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