1 In the diagram shown below, the individual is attempting to pinch a paper between the thumb and the fingers. Weakness of a muscle "A" in the right thumb results in flexion due to the overaction of a muscle "B". The muscles "A" and "B" respectively are

(A) flexor pollicis longus and flexor pollicis brevis

(B) abductor pollicis longus and flexor pollicis longus

(C) adductor pollicis and flexor pollicis longus

(D) extensor digitorum and flex

2. Which nerve injury causes sensory loss in the shaded area in the figure given below:

(A) ulnar nerve

(B) dorsal cutaneous nerve of the forearm

(C) radial nerve

(D) median nerve