Frontotemporal dementia is a disease

该题为细节题。根据第三段第三句“Both had undamaged memories，but displayed the sorts of defect…”可知额颞痴呆症患者的记忆都没有受损，选项A不符合文意；根据第二段第一句“Frontotemporal dementia，a disease usually found with old people，is caused，as its name suggests，by damage to the front and sides of the brain．”可知，额颞痴呆症是由大脑前部和侧面的损坏引起的，而选项B表达的意思是额颞痴呆症会引起大脑某些部分的损毁，与文章原意因果颠倒；根据第五段第一句“This kind of change in musical taste was not seen in any of the Alzheimer’s pafients，and thus appears to be specific to those with frontotemporal dementia．”可知，阿尔茨海默氏病患并没有出现这种音乐品味的变化，仅仅是那些患有额颞痴呆的病患有这样的症状，选项D所述额颞痴呆的症状与阿尔茨海默氏病症状相似的说法是错误的；根据第五段第二句“And other studies have remarked on how frontotemporal-de-mentia patients sometimes gain new talents．”可知，有研究表明额颞痴呆症有可能使患者获得新的才能，故选C。