1st Visible sign of puberty in males is: (A) Testicular enlargement > 3ml in Stage III, (B) Testicular enlargement > 4ml in Stage II, (C) Growth of penis, (D) Testicular enlargement > 3ml in Stage I
Answer is B. Tanner's staging in Males
Stage I :
Testicular size < 4ml
Stage II : 
Sparse hair growth
Scrotum and testis (>4ml) enlarge
Stage III : 
Hair growth darkens
Penis grows in lenght
Stage IV :
Hair growth becomes dense and coarse
Scrotum and penis continues to grow
Growth spurt occurs
Stage V :
Hair growth extend to inner thigh
Genitalia reaches adult size