问题描述：
[单选]
一名15岁女孩表现出瘀伤，鼻epi和重度期。 她最近从病毒感染中康复。 身体检查不明显。 什么是最合适的初步调查？ A 15-year-old girl presents with bruising， epistaxis and heavy periods． She has recently recovered from a viral infection． Physical examination is unremarkable． What is the most appropriate initial investigation？
A．血小板计数Platelet count
B．抗血小板抗体Anti platelet antibodies
C．巨核细胞计数Megakaryocyte count
D．血红蛋白水平Haemoglobin level
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