Option-1 is the correct statement. In the human body, blood flows through a process of double circulation, which means that it follows two separate paths: pulmonary circulation and systemic circulation.

In pulmonary circulation, deoxygenated blood from the right side of the heart is pumped to the lungs to get oxygenated. The oxygen-rich blood then returns to the left side of the heart. From there, the oxygenated blood is distributed throughout the body in systemic circulation.

Therefore, option-1 is correct because oxygenated blood does reach the left side of the heart from the lungs. In the lungs, carbon dioxide is exchanged for oxygen, and the blood becomes oxygenated. This oxygenated blood is then transported back to the left side of the heart through the pulmonary veins and is pumped out to the rest of the body through the systemic circulation.

Options 2, 3, and 4 are incorrect. Blood in the left side of the heart is oxygenated, not deoxygenated, so it is not brought to the right side of the heart. Deoxygenated blood from the body is brought to the right side of the heart, not from the left side. Additionally, oxygenated blood from the right side of the heart is not sent around the body,