**Question:** Not as used as induction agent among the following is ?

A. Propofol
B. Thiopentone
C. Sevoflurane
D. Desflurane

**Core Concept:** Inducing anesthesia is a crucial part of general anesthesia practice, where various agents are used to achieve unconsciousness, amnesia, and muscle relaxation in patients undergoing surgical procedures. Different agents have varying properties, efficacy, and side effects.

**Why the Correct Answer is Right:** Desflurane is a volatile anesthetic agent, similar to sevoflurane, which is widely used for induction and maintenance of general anesthesia. However, it is less commonly used as an induction agent compared to thiopentone and propofol.

**Why Each Wrong Option is Incorrect:**

A. Propofol is a commonly used intravenous anesthetic agent for induction and maintenance of general anesthesia due to its rapid onset, short duration, and minimal side effects.

B. Thiopentone is an intravenous anesthetic agent that is fast-acting, useful for rapid induction, and maintenance of general anesthesia. It is less commonly used nowadays due to concerns about its side effects and newer alternatives.

C. Sevoflurane is a volatile anesthetic agent that has become popular due to its favorable pharmacokinetic and pharmacodynamic properties, including minimal cardiovascular effects and rapid onset of action. It is widely used for induction and maintenance of general anesthesia.

D. Desflurane is a volatile anesthetic agent, similar to sevoflurane, but less commonly used for induction due to its similar properties and a history of preference for other agents like propofol and thiopentone.

**Correct Answer:** B. Thiopentone

**Clinical Pearl:** While all agents have their uses, thiopentone is less commonly used due to concerns about its side effects and newer alternatives like propofol and sevoflurane. Desflurane is similar to sevoflurane but is less commonly used for induction.

**Core Concept:** Induction agents are drugs used to rapidly induce unconsciousness and muscle relaxation in patients undergoing surgery. They are essential components of general anesthesia practice.

**Why Each Wrong Option is Incorrect:**

A. Propofol is a popular intravenous anesthetic agent due to its rapid onset, short duration, and minimal side effects.
B. Thiopentone is an intravenous anesthetic agent with a rapid onset, but is less commonly used due to concerns about its side effects and newer alternatives like propofol and desflurane.
C. Sevoflurane is a volatile anesthetic agent with minimal cardiovascular effects and rapid onset of action, making it a popular choice for induction along with other agents like propofol and thiopentone.
D. Desflurane is a volatile anesthetic agent similar to sevoflurane but less commonly used for induction, likely due to concerns about thiopentone's side effects and newer alternatives like propofol and thiopentone.

**Core Concept:** Induction agents are essential components of general anesthesia practice. Choices for induction may vary depending on