The nutrition of animals is related to
(a)Trophology
(b)Teratology
(c)Dysteleology
(d)Trichology

Hint: Animal nutrition focuses on the required diet of agricultural animals as well as animals in zoos, aquariums, and wildlife management. These are studied under a branch that deals with human dietary combinations.

Complete answer:
Trophology or food combining is the nutritional approach to advocate certain specific combinations of foods such as prescription of healthy diets that exclude foods like sugar, animal protein, whole wheat flours, etc. It was originally promoted by an American naturopath plus alternative medicine advocate Herbert M. Shelton in his book named Food Combining Made Easy. But this matter was previously discussed by Edgar Cayce, an American clairvoyant. The hay diet is the most popular food combining diet that was named after William Howard Hay who lost 30pounds in 3 months by implanting his research.

Additional Information:
Teratology- It is the study of abnormalities of physical development and is related to developmental toxicity that includes all manifestations of abnormal development that are caused by environmental insult. The teratogen substances cause birth defects on an embryo or fetus and include thalidomide, mercury, alcohol, lead, etc.
Dysteleology- It is the philosophical view that existence has no final cause from purposeful design. This concept was introduced by Ernst Haeckel and the term dysteleology is considered as an aggressive yet optimistic form of Science oriented atheism associated with Haeckel and his followers. But nowadays it is more associated with the type of atheism of Richard Dawkins, Sam Harris, or Christopher Hitchens.
Trichology- It is the study of hair and scalp and problems related to them. The person who specializes in this field and with problems like hair loss, baldness, hair breakage, itchy scalp, etc is known as a Trichologist.

So, the correct answer is "Trophology".

Note: The seven major classes of nutrients related to animal nutrition are carbohydrates, proteins, fats, fibers, minerals, vitamins, and water. Some of them are structural like proteins whereas some are sources of energy i.e. carbohydrates and fats. The dietary minerals keep the body healthy and these are mainly calcium, chlorine, magnesium, phosphorus, potassium, sodium, and sulfur.