作为毛细支气管炎的原发病原，下列哪种可能性最小<br>A:<label id="Reply_1011368_ATEST_1005973_0_1_A1型题_305_A" value="A"><label id="Reply_1011368_ATEST_1005973_0_1_A1型题_305_B" value="B"><label id="Reply_1011368_ATEST_1005973_0_1_A1型题_305_C" value="C"><label id="Reply_1011368_ATEST_1005973_0_1_A1型题_305_D" value="D"><label id="Reply_1011368_ATEST_1005973_0_1_A1型题_305_E" value="E"><label for="Reply_1011368_ATEST_1005973_0_1_A1型题_305_E">呼吸道合胞病毒<br>B:流感病毒<br>C:副流感病毒<br>D:腺病毒<br>E:肺炎球菌</label></label></label></label></label></label>