Final answer:
Option (b), The Trendelenburg test assesses the strength of the gluteus medius muscle. For the largest muscle in the lower leg, the gastrocnemius is the correct answer.
Step-by-step explanation:
The Trendelenburg test is commonly used to assess the weakness of the gluteus medius muscle. When a person stands on one leg, if the pelvis drops on the side opposite to the stance leg, it indicates weakness in the gluteus medius of the stance leg. This muscle is crucial for maintaining pelvis stability during gait.
Regarding the question about the largest muscle in the lower leg, the correct answer is b. gastrocnemius. The gastrocnemius, along with the soleus muscle, forms the calf muscle group. The gastrocnemius is the most superficial and prominent muscle in the calf, contributing to plantar flexion of the foot at the ankle and flexing the leg at the knee joint.