下列哪项成份低于正常值会导致贫血（ ）
A．白细胞
B．血小板
C．红细胞和血红蛋白
D．白细胞和红细胞
贫血患者是因血液内血红蛋白的数量过少或红细胞的含量过少而造成的，血红蛋白是一种红色含铁的蛋白质，血红蛋白的特性是：在氧含量高的地方，与氧容易结合；在氧含量低的地方，又与氧容易分离，贫血患者血液运输氧的能力低，影响体内各器官的正常生理活动，因而表现出精神不振、疲劳、头晕、面色苍白等症状，一般的贫血患者，应多吃一些含蛋白质和铁质丰富的食物．可见C符合题意．
故选：C
An analyst gathers the following information from a company's balance sheet (in millions):
| 31 December 2011 | 31 December 2010 | |
| Cash and marketable securities | $66 | $60 |
| Receivables | $22 | $20 |
| Current assets | $132 | $120 |
| Total assets | $1498 | $1345 |
| Current liabilities | $242 | $220 |
| Total liabilities | $1189 | $987 |
A. decreased since the end of 2010.
B. remained the same since the end of 2010.
C. increased since the end of 2010.