While a client with hypertension is being assessed, he says to the nurse, "I really don’t know why I’m here. I feel fine and haven’t had any symptoms. " Which of the following would be the nurse’s best response

A. "Symptoms of hypertension are often not present. "
B. "Symptoms of hypertension signify a high risk of stroke. "
C. "Symptoms of hypertension occur only with malignant hypertension. "
D. "Symptoms of hypertension appear after irreversible kidney damage has occurred. "

什么是核分析技术，其特点是什么？