Okay, let me tackle this question about the weight of an adult eyeball. First, I need to recall the core concept here. The question is testing basic anatomical knowledge of the eye's structure and measurements. The weight of the eyeball is a standard fact that medical students should know for exams like NEET PG or USMLE.

Now, the correct answer is likely 7 grams. I remember that the adult human eyeball is roughly a sphere with a diameter of about 24 mm. The average weight is around 7 grams. Let me verify that. Yes, sources confirm that the adult eyeball weighs approximately 7 grams. This is important for understanding ocular anatomy and conditions like glaucoma, where intraocular pressure is a key factor.

For the incorrect options, I need to think about common distractors. If the options were 5 grams, 10 grams, 15 grams, etc., each would be wrong. For example, 5 grams might be too light, perhaps the weight of a younger child's eye. 10 grams would be heavier than normal, possibly due to swelling or a pathological condition. 15 grams is way off, maybe a mistake in units or confusion with another organ.

The clinical pearl here is to remember the standard measurements: 24 mm in diameter and 7 grams in weight. This helps in diagnosing conditions where the eye's size or weight might be abnormal, such as in cases of tumors or congenital anomalies. Also, knowing these basics is crucial for exams where factual recall is tested.

So, putting it all together, the explanation should highlight the standard weight, why the other options are wrong, and the importance of this fact in clinical settings.

**Core Concept**
The weight of the adult human eyeball is a standard anatomical fact critical for understanding ocular physiology and pathology. It relates to the eye's structure, including the sclera, choroid, retina, and intraocular fluids.

**Why the Correct Answer is Right**
The average weight of an adult human eyeball is approximately **7 grams**. This is measured after enucleation and accounts for the eye's spherical shape (24 mm in diameter), composed of the cornea, lens, vitreous humor, and surrounding tissues. The weight is essential for calculating intraocular pressure and assessing ocular volume in conditions like glaucoma or ocular tumors.

**Why Each Wrong Option is Incorrect**
**Option A:** 5 grams is incorrect; this is closer to the weight of a fetal or neonatal eyeball.
**Option B:** 10 grams is incorrect; this overestimates the normal adult eye, which could occur in pathological hypertrophy or edema.
**Option C:** 15 grams is incorrect; this is far above the normal range and may indicate severe pathological conditions like intraocular tumors.

**Clinical Pearl / High-Yield Fact**
Remember the "7-gram rule" for the adult eye. This fact is frequently tested in anatomy exams and serves as a baseline for diagnosing ocular abnormalities, such as buphthalmos (enlarged eye in congenital glaucoma).

**Correct Answer: C. 7 grams**

✓ Correct Answer: A. 7 g