A suitable title for the passage would be:

Concept: The title of a passage names the one subject that the passage as a whole is about — the topic that every part of the text goes on to develop. A phrase that occurs inside a single sentence, or an idea that merely supports the main subject, is a detail of the passage and not its title. A candidate title is therefore tested by asking whether all of the passage's statements can be read as statements about it.

Applying it to this passage: Set out what the passage actually asserts, in order:

1. Health is defined as a dynamic balance of the internal environment that positively impacts the sense organs, mind and the self.

2. Each individual has a specific mental and physical constitution, and that constitution fixes both the vulnerability to disease and the scope for achieving higher levels of health.

3. A personalized approach to medicine has been advocated from historical times, and advances in human and medical genetics have brought modern medicine to the same personalized approach.

4. The balance of the inner environment can be maintained only by establishing harmony with the external environment.

5. The human being is an epitome of the universe: the microcosm is a miniature of the macrocosm and is made of the same elements that make up nature.

6. Healthcare therefore becomes ecology-conscious — the plants growing around the people of a locality suit them best, and a lifestyle must be carved to fit the geographical region and the changing seasons.

All six statements are made about one and the same system. The passage attributes to Ayurveda its definition of health, its early advocacy of personalized medicine, its view of the human being as an epitome of the universe, and its growth into an ecology-conscious form of healthcare. The subject that the entire passage develops is therefore Ayurveda, and that is the title the passage as a whole falls under.

Comparing the candidate titles:

• “Dynamic Balance” is the phrase used inside the definition of health in the very first statement. As a title it names only that one strand and does not extend over the account of personalized medicine, of the microcosm and macrocosm, or of the growth of an ecology-conscious form of healthcare.

• "Internal and External Environment" is the pair named in the statement about maintaining inner balance; it leaves out the account of personalized medicine and of ecology-conscious healthcare.

• "Disease Treatment in India" supplies two things the passage never does — a therapy or course of treatment, and a national setting; disease enters the passage only as a vulnerability arising from an individual's constitution.

Result: Ayurveda.