Media contain blood, hematin and DNA.. Chocolate agar

Media contain blood, hematin and DNA:

• A. Blood agar
• B. MaCconky
• C. Chocolate agar
• D. XLD.

Out of the four options, only chocolate agar contains blood, hematin, and DNA. So the answer is: C. Chocolate agar

Here's a brief explanation of each option:

- Blood agar:

This type of media contains whole blood, which provides nutrients for a wide variety of bacteria. However, it does not contain hematin or isolated DNA.

- MacConkey agar:

This media is used to differentiate between lactose-fermenting and lactose-non-fermenting bacteria. It does not contain blood, hematin, or DNA.

- Chocolate agar:

This media is made from blood agar that has been heated, which lyses (breaks open) the red blood cells and releases hematin. Hematin is a breakdown product of hemoglobin and provides a source of iron, which is essential for the growth of some bacteria. Chocolate agar also contains DNA from the lysed red blood cells.

- XLD agar:

This media is used to differentiate between lactose-fermenting and lactose-non-fermenting bacteria, as well as to identify Salmonella and Shigella species. It does not contain blood, hematin, or DNA.