You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following is a stain for heart failure cells? and explain in detail?
Heart failure cells, also called siderophages, are hemosiderin-containing macrophages in the alveoli of lung and these cell denote previous episodes of pulmonary edema due to left-sided heart failure.
Hemosiderin is nothing else but stored iron granules.
So, heart failure cells contain iron granules and thus will require a stain that is used for iron.
Stain used for iron is Prussian blue reaction (Perl's iron stain)