**Core Concept**
Raised intracranial pressure (ICP) triggers a complex physiological response to protect the brain from further injury. This response involves the activation of various neural pathways and the release of certain neurotransmitters and hormones that ultimately affect cardiovascular function.

**Why the Correct Answer is Right**
When ICP increases, the body attempts to reduce the pressure by decreasing the amount of blood flowing to the brain. This is achieved by increasing the resistance to blood flow through the cerebral vessels, which is mediated by the release of vasopressor substances such as vasopressin and angiotensin II. As a result, the heart rate decreases to prevent further increases in blood pressure and cardiac workload. The increased peripheral resistance also contributes to the elevated blood pressure. The Cushing's reflex, a classic physiological response to increased ICP, is characterized by a triad of hypertension, bradycardia, and irregular breathing.

**Why Each Wrong Option is Incorrect**
**Option A:** Hemorrhage typically leads to hypotension due to blood loss and decreased blood volume, rather than increased blood pressure.

**Option B:** High altitude is associated with hypoxia, which can lead to increased sympathetic tone and hypertension, but it does not typically cause bradycardia.

**Option D:** Anemia is characterized by decreased red blood cell mass, which can lead to increased cardiac output and heart rate to compensate for the decreased oxygen-carrying capacity.

**Clinical Pearl / High-Yield Fact**
The Cushing's reflex is a critical physiological response to increased intracranial pressure that can be remembered using the mnemonic "3 Hs and 1 C": Hypertension, Headache, Hyperthermia, and Cushing's reflex (hypertension, bradycardia, and irregular breathing).

**✓ Correct Answer: C. Raised intracranial pressure**