Final answer:
The start of the meridian dealing with elimination is the radial side of the index finger, known as the Large Intestine 1 (LI-1) point, situated according to the lateral orientation of the thumb after the upper limb's rotation.
Step-by-step explanation:
The beginning point for the meridian dealing with elimination is a. Radial side of index finger (LI-1). In Traditional Chinese Medicine, this point is known as the Large Intestine 1 (LI-1) point and it is utilized in practices like acupuncture for treatment related to the large intestine's functions, particularly elimination. Point LI-1 is found at the radial side of the index finger, which is consistent with the orientation of the upper limb rotation that leaves the thumb, and consequently the radial side of the hand, facing laterally.