【名词&注释】
医疗机构(medical institutions)、青春期(puberty)、幼儿期(toddler age)、完整性(integrity)、有害物质(harmful substance)、不符合(inconformity)、皮肤角质层(keratoderma)、自我意识发展(self-awareness development)、皮肤微循环(skin microcirculation)、个体自我意识(the self-awareness of individual)
[单选题]个体自我意识(the self-awareness of individual)发展(self-awareness development)的开始时期是()
A. 婴儿期
B. 幼儿期
C. 学龄期
D. 青春期