 <translate> To answer this question, we should know that: The first point along the graph where a response above zero (or above the control response) is reached is usually referred to as a threshold-dose. The answer is The first point along the graph where a response above zero ( or above the control response ) is reached. <yor> Láti dáhùn ìbéèrè yìí, a gbọ́dọ̀ mọ̀ pé: Àkókó àkọ́kọ́ nínú àwòrán náà níbi tí ìdáhùn ti dé ibi tí ó ga ju òfo lọ (tàbí ibi tí ìdáhùn àyẹ̀wò ti dé) ni a sábà máa ń pè ní ìpele-ìtọ́jú. Ìdáhùn náà ni àlàfo àkọ́kọ́ tí ìdáhùn rẹ̀ ti ga ju òfo lọ (tàbí ìdáhùn tó ga ju ìdáhùn àbójútó lọ). 