**Core Concept**
Audiometric evaluation in infants requires a non-invasive, objective, and sensitive method to assess hearing thresholds. The chosen investigation should be capable of detecting even slight changes in auditory function.

**Why the Correct Answer is Right**
Otoacoustic Emissions (OAE) testing is the preferred method for audiometric evaluation in infants. This is because OAE testing measures the sound generated by the inner ear in response to external stimulation, providing an objective assessment of auditory function. The testing process involves introducing a sound into the ear canal and measuring the response using a sensitive microphone. This method is particularly useful in infants as it is non-invasive, quick, and does not require active participation from the subject.

**Why Each Wrong Option is Incorrect**
**Option A:** Behavioral audiometry is not suitable for infants as it requires active participation from the subject, which is not possible in infants.
**Option B:** Caloric test is used to assess vestibular function, not auditory function.
**Option C:** Brainstem Auditory Evoked Response (BAER) testing is more invasive and requires electrodes to be placed on the scalp, making it less suitable for routine audiometric evaluation in infants.

**Clinical Pearl / High-Yield Fact**
OAE testing is a valuable tool in neonatal hearing screening programs, allowing for early detection and intervention in cases of hearing impairment.

**Correct Answer: C. Caloric test is used to assess vestibular function, not auditory function.