**Core Concept:** Local anaesthetics are a class of drugs that block the conduction of nerve impulses by inhibiting voltage-gated sodium channels in the axon membrane. They are classified into two groups: amide-type and ester-type local anaesthetics. Ester-type local anaesthetics are more likely to cause a fall in blood pressure (hypotensive effect) due to their lipophilic nature. On the other hand, amide-type local anaesthetics are less likely to cause a hypotensive effect as they have a hydrophilic nature.

**Why the Correct Answer is Right:** The correct answer, D-lidocaine, belongs to the amide-type local anaesthetics. As mentioned earlier, these drugs are less likely to cause a hypotensive effect due to their hydrophilic nature. Lidocaine's lipophilic nature makes it more suitable for ester-type local anaesthetics, which are more likely to cause a fall in blood pressure.

**Why Each Wrong Option is Incorrect:**

A. Bupivacaine: This is also an amide-type local anaesthetic and has a similar risk profile as lidocaine, not causing a hypotensive effect.

B. Levobupivacaine: Another amide-type local anaesthetic, similar to lidocaine and bupivacaine, it is less likely to cause hypotension.

C. Ester-type local anaesthetics: As mentioned earlier, this class of drugs is more likely to cause a hypotensive effect due to their lipophilic nature.

**Clinical Pearl:** A hypotensive effect from local anaesthetics is usually attributed to a dose-dependent reduction in cardiac output and peripheral vasodilation. Ester-type local anaesthetics have a higher risk of causing hypotension due to their lipophilic nature, allowing them to cross the blood-brain barrier and affect the central nervous system. In contrast, amide-type local anaesthetics have a lower risk of causing hypotension, as they are less likely to cross the blood-brain barrier and affect the central nervous system.