Transaminase are the enzymes concerned with transfer of atoms or group of atoms or electrons.. so, option B is correct not A

**Explanation:**

The correct answer is option **d) Dehydrogenase**.

Enzymes are proteins that catalyze biochemical reactions in living organisms. They speed up the rate of chemical reactions by reducing the activation energy required for the reaction to occur. Enzymes are specific for the reactions they catalyze and often have unique names based on their specific function.

One of the important functions of enzymes is to facilitate the transfer of electrons during biochemical reactions. This is crucial for the production of energy and the synthesis of various molecules in the body. One class of enzymes involved in electron transfer is called **dehydrogenases**.

**Dehydrogenases** are enzymes that catalyze the removal of hydrogen atoms (H) from a molecule and transfer them to an electron carrier molecule, such as NAD+ (nicotinamide adenine dinucleotide) or FAD (flavin adenine dinucleotide). The hydrogen atoms are transferred as electrons (H+ + e-) during this process.

The transfer of electrons is an essential part of many metabolic pathways. For example, in cellular respiration, glucose is oxidized to produce energy in the form of ATP (adenosine triphosphate). This process involves a series of reactions catalyzed by various dehydrogenases, such as glucose dehydrogenase and pyruvate dehydrogenase.

In addition to energy production, dehydrogenases are also involved in other important biological processes. For instance, alcohol dehydrogenase is responsible for the breakdown of alcohol in the liver, while lactate dehydrogenase is involved in the conversion of lactate to pyruvate during anaerobic metabolism.

Therefore, the correct answer to the question is option **d) Dehydrogenase**, as this enzyme is specifically concerned with the transfer of electrons during biochemical reactions.