Step 1: Break down the phrase.
"What was heard from above" points to knowledge received directly through divine revelation rather than composed by a human author.
Step 2: Eliminate the other terms.
Dharma refers to duty or righteous conduct, while Yajur and Sama are names of two specific Vedas, none of them carry this general meaning of heard knowledge.
Step 3: Identify the right term.
Shruti literally translates as that which is heard, and covers the Vedas and Upanishads regarded as directly revealed sacred knowledge.
\[ \boxed{\text{Shruti}} \]