**Core Concept**
Professional secrecy, also known as doctor-patient confidentiality, is a fundamental principle in medical ethics. It requires healthcare professionals to maintain the secrecy of sensitive patient information, ensuring that patients feel secure in sharing personal details with their healthcare providers.

**Why the Correct Answer is Right**
The Hippocratic Oath emphasizes the importance of confidentiality, and healthcare professionals are ethically bound to respect patient trust. In situations where divulging confidential information is necessary, it is typically done with the patient's consent or in accordance with legal requirements, such as reporting child abuse or infectious diseases. Healthcare professionals may also be required to disclose information in the event of a court order or when it is necessary to protect the patient or others from harm.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because divulging confidential information without a valid reason would be a breach of professional secrecy and ethics.
**Option B:** This option is not specified, but it is likely incorrect for the same reasons as Option A.
**Option C:** This is incorrect because it is a vague and unspecified condition that does not justify divulging confidential information.
**Option D:** This is incorrect because it is not a valid reason for divulging confidential information.

**Clinical Pearl / High-Yield Fact**
A key principle in maintaining professional secrecy is to ensure that patients are fully informed about how their confidential information will be used and protected. This includes obtaining informed consent for sharing information with other healthcare professionals or third-party organizations.

**Correct Answer: D. Informed consent from the patient.**