**Core Concept**
Medical negligence is a crucial aspect of forensic medicine, and the Supreme Court has established guidelines to determine when a doctor can be held liable. Section 304-A of the Indian Penal Code pertains to causing death by negligence, and the court's judgment is critical in defining the circumstances under which a doctor can be charged.

**Why the Correct Answer is Right**
Gross negligence refers to a significant deviation from the standard of care expected from a medical professional. This could involve a blatant disregard for established protocols, a failure to recognize warning signs, or a conscious decision to prioritize other interests over patient care. Gross negligence is a critical factor in determining medical negligence, as it indicates a significant departure from the expected standard of care. The court's judgment emphasizes that gross negligence is a necessary condition for charging a doctor under section 304-A. This means that inadvertent errors or minor lapses in judgment may not be sufficient to establish medical negligence.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the Supreme Court judgment does not specifically mention corporate hospitals as a criterion for charging medical negligence. The judgment focuses on the nature of the negligence rather than the type of hospital.
**Option B:** This option is incorrect because inadvertent errors are not sufficient to establish medical negligence under section 304-A. The court's judgment requires a more significant deviation from the standard of care, which is not present in cases of inadvertent errors.
**Option D:** This option is incorrect because Res ipsa loquitur is a doctrine that implies negligence based on the circumstances of the case. However, it is not a necessary condition for charging medical negligence under section 304-A. The court's judgment emphasizes the need for gross negligence, which is a more specific and severe deviation from the standard of care.

**Clinical Pearl / High-Yield Fact**
A key takeaway from this judgment is that gross negligence is a critical factor in determining medical negligence. This means that doctors must be extremely vigilant in their practice and adhere to established protocols to avoid being charged under section 304-A.

**✓ Correct Answer: C. Gross negligence**