我觉得是codeine
原因有二,
一、逻辑意思,全文的中心高频词肯定是theobromine,一种新发现的药,为了介绍他的药效,用codeine对比,所以应显示codeine的地位,即which（codeine） was considered the bestcough medicine at present
二、习惯用法.一般来说,老外绝对是把现行词放在定语从句的前面.这样简单,不易混淆.
英语定语从句题!Their study found that theobromine,found in cocoa,wa
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