**Core Concept**
The anaesthesia machine is a complex device that delivers a precise mixture of gases to a patient undergoing surgery. It consists of multiple systems, including the high-pressure system, low-pressure system, and a scavenging system. The machine's design and functionality are crucial for ensuring patient safety.

**Why the Correct Answer is Right**
Option a) states that the cylinder is a part of the high-pressure system. This is correct because the cylinders containing anaesthetic gases and oxygen are connected to the high-pressure system, which is designed to withstand the high pressure of the gas cylinders. The high-pressure system is responsible for delivering the precise mixture of gases to the patient.

Option b) states that the O2 flush delivers 35 liters, which is incorrect. The O2 flush valve is designed to deliver a high flow rate of oxygen to the patient, typically up to 35-75 liters per minute, but not a fixed volume of 35 liters.

Option d) states that the pipeline is a part of the low-pressure system, which is correct. The pipeline oxygen and nitrous oxide are connected to the low-pressure system, which is designed to deliver a lower pressure gas mixture to the patient.

**Why Each Wrong Option is Incorrect**
**Option c:** This option is not provided, so we will not discuss it.

**Clinical Pearl / High-Yield Fact**
It is essential for anaesthetists to understand the different systems of the anaesthesia machine and how they interact to ensure patient safety. The high-pressure system and low-pressure system must be properly connected and functioning to deliver a precise mixture of gases to the patient.

**Correct Answer:** D. Pipeline is a part of low pressure system