**Core Concept**
Health sector planning involves the systematic process of setting goals, objectives, and strategies to improve healthcare outcomes. It encompasses various components to ensure effective allocation of resources and efficient delivery of healthcare services.

**Why the Correct Answer is Right**
Health sector planning typically includes the following components:
- **Needs Assessment**: Identifying healthcare needs of the population,
- **Policy Formulation**: Developing policies to address healthcare needs,
- **Resource Allocation**: Allocating resources such as human resources, infrastructure, and equipment,
- **Program Implementation**: Implementing healthcare programs and services,
- **Monitoring and Evaluation**: Monitoring and evaluating the effectiveness of healthcare programs.

**Why Each Wrong Option is Incorrect**
**Option A:** Resource Mobilization is a crucial aspect of health sector planning, as it involves securing the necessary funds and resources to implement healthcare programs.

**Option B:** Health Sector Reform is a process of changing the existing healthcare system to improve its performance and effectiveness, which is also an essential part of health sector planning.

**Option C:** Health Sector Reform is a process of changing the existing healthcare system to improve its performance and effectiveness, which is also an essential part of health sector planning.

**Clinical Pearl / High-Yield Fact**
A well-planned health sector can significantly improve healthcare outcomes, reduce healthcare costs, and increase patient satisfaction.

**Correct Answer:** D.