Choose the true statement.

• A. Stretch reflexes are hyperactive in comatose patients.
• B. The flexor reflex is initiated by painful stimuli.
• C. The knee jerk reflex is an example of a superficial reflex.
• D. The abdominal reflex is an example of a tendon reflex.

Answer: (B)

Verified step by step guidance

1. Begin by understanding the different types of reflexes mentioned in the problem: stretch reflex, flexor reflex, superficial reflex, and tendon reflex.
2. The stretch reflex is a muscle contraction in response to stretching within the muscle. It is typically not hyperactive in comatose patients; rather, it may be diminished or absent.
3. The flexor reflex, also known as the withdrawal reflex, is initiated by painful stimuli. This reflex causes the body to withdraw from the source of pain, which is a protective mechanism.
4. The knee jerk reflex, or patellar reflex, is a type of stretch reflex, not a superficial reflex. Superficial reflexes are elicited by gentle stimulation of the skin, such as the abdominal reflex.
5. The abdominal reflex is a superficial reflex, not a tendon reflex. Tendon reflexes involve the contraction of muscles in response to a stretch applied to the tendon, such as the knee jerk reflex.