Topic: Gender (লিঙ্গ),

Best Answer Explained in Below-:

In the context of equine terminology, "colt" specifically refers to a young male horse, typically under the age of four. To identify the feminine counterpart, we look for a term that denotes a young female horse. The correct choice is **B) filly**. A filly is defined as a young female horse that is not yet a mare. This distinction is important in animal husbandry and breeding contexts.

The other options do not serve as the correct feminine counterpart. **A) horse** is a general term that refers to the species as a whole and does not specify gender. **C) mare** denotes an adult female horse, which is not an appropriate match for the youthful stage indicated by "colt." Finally, **D) folly** is unrelated to equine terminology and is simply a noun denoting a lack of good sense or foolishness. Therefore, the specific and fitting term for the feminine gender of "colt" is indeed "filly," as it accurately reflects a young female horse.