निम्नलिखित में से कौन सा शब्द अपघर्षक पत्थर (abrasive stone) का उपयोग करके माइक्रोटोम चाकू को तेज करने की विशिष्ट विधि को संदर्भित करता है?

Which of the following chemicals is commonly used as a clearing agent to remove paraffin from tissue slides?

When living cells are stained after being removed from the organism's body, the technique is referred to as __________ staining.