Liver and stomach belong to the same joke.

Liver: The membrane outside the liver is composed of epithelial cells and belongs to epithelial tissue. Inside and outside are covered with blood vessels and nerves. Blood in blood vessels belongs to connective tissue, and nerves belong to nerve tissue. It can be seen that the liver is an organ composed of different tissues combined together in a certain order.

Stomach: The inner surface of the stomach is composed of epithelial cells and belongs to epithelial tissue. The stomach wall is mainly muscle tissue, which can contract and relax to promote the peristalsis of the stomach to digest food. The whole stomach is full of rich blood vessels and nerves. The blood in the blood vessels belongs to connective tissue and the nerves belong to nerve tissue. Therefore, the stomach is an organ composed of epithelial tissue, muscle tissue, connective tissue and nerve tissue in a certain order.

Muscle: The outer membrane belongs to epithelial tissue, and the muscle abdomen is mainly muscle tissue, with abundant blood vessels and nerves distributed inside and outside. Blood in tendons and blood vessels at both ends belongs to connective tissue, and nerves belong to nerve tissue. It can be seen that muscle is also an organ composed of several different tissues in a certain order.

So the answer is X.