**Core Concept**
Ketamine hydrochloride is a medication used for starting and maintaining anesthesia. It has several relative contraindications due to its pharmacological properties, which include analgesia, sedation, and dissociative effects. The correct administration of ketamine requires careful consideration of these contraindications to prevent potential adverse effects.

**Why the Correct Answer is Right**
Ketamine is contraindicated in patients with a history of psychosis or schizophrenia, as it can exacerbate these conditions by inducing a dissociative state that may worsen hallucinations and delusions. Additionally, ketamine should be used with caution in patients with a history of substance abuse, as it can cause dependence and addiction. Furthermore, ketamine should not be administered to patients with severe hypertension or head trauma, as it can increase intracranial pressure and worsen hypertension.

**Why Each Wrong Option is Incorrect**
**Option A:** While a history of substance abuse is a relative contraindication, it is not the only one. Other factors, such as severe hypertension and head trauma, also play a role in determining the safety of ketamine administration.
**Option B:** This option is not a recognized contraindication for ketamine. In fact, ketamine is often used in emergency medicine to manage acute pain and sedate patients.
**Option C:** This option is not a contraindication for ketamine. In fact, ketamine can be used to manage severe hypertension in certain situations.

**Clinical Pearl / High-Yield Fact**
It is essential to carefully evaluate a patient's medical history and mental status before administering ketamine to avoid potential adverse effects. A thorough pre-anesthetic evaluation is crucial to determine the suitability of ketamine for a particular patient.

**Correct Answer: D.**