单选题：根据以下资料，回答题：某儿童在进食杏仁后1小时出现恶心、呕吐、头痛、呼吸困难，送医院急救，诊断为苦杏仁食物中毒。苦杏仁

题目内容：

根据以下资料，回答题：
某儿童在进食杏仁后1小时出现恶心、呕吐、头痛、呼吸困难，送医院急救，诊断为苦杏仁食物中毒。
苦杏仁中的有毒成分是

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答案解析：

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