The conversion of milk to curd is a fermentation process carried out by lactic acid bacteria. This transformation not only changes the texture and taste of milk but also enhances its nutritional profile. One of the significant nutritional improvements in this process is the increase in the amount of Vitamin B12.
Let's analyze why Vitamin B12 is increased and rule out other options:
Therefore, the correct answer is an increase in Vitamin B12, making curd more nutritious in terms of this specific vitamin compared to milk.