Anal gland has odorous secretion in mammals. Anal gland are small paired sacs located on either side of anus between the external and internal Spintcher muscles .
So option " A " is correct answer.

The gland that secretes odorous secretion in mammals is the anal gland.

Explanation:
The anal gland is a small gland located in the anal region of mammals. It is present in various species including dogs, cats, skunks, and many others. These glands play a crucial role in communication, as the secretions they produce contain a strong odor that is used for marking territories, attracting mates, and signaling social status.

The anal gland is made up of specialized cells that produce a thick, oily substance known as anal sac secretion. This secretion is stored in the anal glands and is released through small ducts located on either side of the anus. When an animal defecates or feels threatened, the muscles around the anal glands contract, causing the secretion to be expelled.

The anal sac secretion contains a variety of volatile compounds, including fatty acids, proteins, and sulfur compounds, which give it its distinct odor. These compounds can vary in composition and concentration between different species and even individuals within the same species. The odor produced by the anal gland secretion serves as a form of chemical communication, allowing animals to convey information about their presence, reproductive status, and dominance to other members of their species.

In some cases, the anal gland secretion can also serve as a defense mechanism. Skunks, for example, are well-known for their ability to spray a foul-smelling liquid from their anal glands when threatened. This odor acts as a deterrent to potential predators and can be highly effective in warding off attacks.

In conclusion, the anal gland secretes an odorous secretion in mammals, which plays a crucial role in communication and defense. The distinct odor produced by this secretion allows animals to convey information and establish their presence and social status within their respective species.