**Core Concept**
IPD (In-Patient Department) records are a crucial part of a patient's medical history, and their preservation is governed by legal and medical regulations. The duration for which these records are preserved is essential for maintaining patient confidentiality, facilitating medical research, and ensuring accountability in healthcare.

**Why the Correct Answer is Right**
According to the Medical Council of India (MCI) and various state medical councils, IPD records must be preserved for a minimum of 3 years from the date of discharge. This is to ensure that patients can access their medical records, and healthcare providers can maintain accurate medical histories. The 3-year period allows for adequate time to review and update medical records, as well as to address any potential medical errors or complications that may arise during this timeframe.

**Why Each Wrong Option is Incorrect**
**Option A:** Preserving IPD records for only 1 year is insufficient, as it may not allow for adequate time to review and update medical records, potentially leading to inaccuracies or omissions.
**Option C:** Preserving IPD records for 5 years may be excessive, as it may not be necessary to retain records for such an extended period, especially if the patient's condition has been resolved or they have been transferred to outpatient care.
**Option D:** Preserving IPD records for 7 years is not a standard practice, and it may not be necessary to retain records for such an extended period, especially if the patient's condition has been resolved or they have been transferred to outpatient care.

**Clinical Pearl / High-Yield Fact**
It is essential for healthcare providers to maintain accurate and up-to-date medical records, as they can serve as a legal document in case of medical errors or malpractice claims. IPD records should be stored securely and made available to patients upon request, in accordance with local laws and regulations.

**✓ Correct Answer: B. 3 years**