**Core Concept**
The World Health Organization (WHO) periodically updates its slogan to reflect its evolving mission and goals. In 2005, the WHO introduced a new slogan that encapsulates its commitment to promoting health and well-being globally.

**Why the Correct Answer is Right**
The WHO's 2005 slogan was "Make Every Mother and Child Count." This slogan emphasizes the importance of improving maternal and child health, which is a critical component of achieving the Millennium Development Goals (MDGs). The slogan highlights the need to focus on the most vulnerable populations, namely pregnant women and children, to reduce mortality rates and improve health outcomes.

**Why Each Wrong Option is Incorrect**
**Option A:** This option does not accurately represent the WHO's 2005 slogan.
*Option B*: There is no record of this slogan being used by the WHO in 2005.
**Option C:** While the WHO has emphasized the importance of health systems strengthening, this slogan does not capture the essence of the organization's 2005 message.

**Clinical Pearl / High-Yield Fact**
The WHO's 2005 slogan serves as a reminder of the importance of prioritizing maternal and child health in global health initiatives. This focus has led to significant improvements in health outcomes, particularly in reducing child mortality rates.

**Correct Answer: C. Health is a fundamental human right.**