**Core Concept**
Sec 320 of the Indian Penal Code (IPC) defines grievous hurt, a serious injury that can lead to permanent disfigurement or disability. The section lists various types of injuries that are considered grievous.

**Why the Correct Answer is Right**
To identify the correct answer, we need to examine each option against the definition of grievous hurt under Sec 320 of the IPC. Grievous hurt includes emasculation, permanent privation of the sight of either eye, permanent privation of the hearing of either ear, privation of any member or joint, destruction or permanent impairing of the powers of any member or joint, and any hurt which endangers life or which causes the sufferer to be during the space of twenty days in severe bodily pain, or unable to follow his ordinary pursuits.

**Why Each Wrong Option is Incorrect**
* **Option A:** Emasculation is indeed a grievous hurt as per Sec 320 of the IPC, which involves the removal or destruction of the male genital organs.
* **Option B:** Permanent privation of the sight of either eye is also a grievous hurt as per the IPC.
* **Option C:** Destruction or permanent impairing of the powers of any member or joint is a grievous hurt as per Sec 320 of the IPC.
* **Option D:** Being thrown into the water, which may lead to drowning, is not explicitly listed as a grievous hurt under Sec 320 of the IPC.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the IPC defines grievous hurt to ensure that serious injuries are punished more severely than minor ones.

**Correct Answer:** D. Being thrown into the water, which may lead to drowning, is not explicitly listed as a grievous hurt under Sec 320 of the IPC.