Read the following statements:
A.scala media is also known as cochlear duct
B.Scala vestibuli and scala media contain endolymph and perilymph respectively
C.Enlarged bases of semicircular canals contain projecting ridges called cristae ampullaris
D.Saccule and utricle are parts of otolith organ

Options

A. FTTT
B. TFFF
C. FTTF
D. TTTT

Answer

To solve the question, we need to evaluate each of the given statements about the anatomy of the ear and determine their validity.

### Step-by-Step Solution:

1. **Statement A: Scala media is also known as cochlear duct.**
- The scala media, indeed, is another name for the cochlear duct. It is the central part of the cochlea and is filled with endolymph.
- **Conclusion:** This statement is **True**.

2. **Statement B: Scala vestibuli and scala media contain endolymph and perilymph respectively.**
- The scala vestibuli is filled with perilymph, while the scala media (cochlear duct) is filled with endolymph. Therefore, the statement incorrectly assigns the fluids to the wrong scala.
- **Conclusion:** This statement is **False**.

3. **Statement C: Enlarged bases of semicircular canals contain projecting ridges called cristae ampullaris.**
- The cristae ampullaris are indeed located in the ampullae of the semicircular canals and contain hair cells that are involved in balance.
- **Conclusion:** This statement is **True**.

4. **Statement D: Saccule and utricle are parts of the otolith organ.**
- The saccule and utricle are indeed parts of the vestibular system and are referred to as otolith organs, which help in detecting linear acceleration and head position.
- **Conclusion:** This statement is **True**.

### Summary of Statements:
- A: True
- B: False
- C: True
- D: True

### Final Answer:
Based on the evaluations, the correct answer is the option that corresponds to the truth values: **True, False, True, True**.