【名词&注释】
青春期(puberty)、结核杆菌(mycobacterium tuberculosis)、学龄期(school age)、传代培养(subculture)、二巯基丙磺酸钠、婴儿期(infancy)、类毒素(toxoid)、自我意识发展(self-awareness development)、抗毒素(antitoxin)、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